1968785641 has 3 divisors (see below), whose sum is σ = 1968830013. Its totient is φ = 1968741270.

The previous prime is 1968785591. The next prime is 1968785653. The reversal of 1968785641 is 1465878691.

The square root of 1968785641 is 44371.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1968785641 - 2⁷ = 1968785513 is a prime.

It is a super-2 number, since 2×1968785641² = 7752233800415561762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968780641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22186 + ... + 66556.

It is an arithmetic number, because the mean of its divisors is an integer number (656276671).

Almost surely, 2^1968785641 is an apocalyptic number.

1968785641 is the 44371-st square number.

1968785641 is the 22186-th centered octagonal number.

It is an amenable number.

1968785641 is a deficient number, since it is larger than the sum of its proper divisors (44372).

1968785641 is an frugal number, since it uses more digits than its factorization.

1968785641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88742 (or 44371 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 55.

The cubic root of 1968785641 is about 1253.3320468257.

The spelling of 1968785641 in words is "one billion, nine hundred sixty-eight million, seven hundred eighty-five thousand, six hundred forty-one".