1975944657 has 16 divisors (see below), whose sum is σ = 2658078720. Its totient is φ = 1305579600.

The previous prime is 1975944647. The next prime is 1975944671. The reversal of 1975944657 is 7564495791.

It is a happy number.

It is not a de Polignac number, because 1975944657 - 2¹¹ = 1975942609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1975944597 and 1975944606.

It is not an unprimeable number, because it can be changed into a prime (1975944647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358432 + ... + 363902.

It is an arithmetic number, because the mean of its divisors is an integer number (166129920).

Almost surely, 2^1975944657 is an apocalyptic number.

It is an amenable number.

1975944657 is a deficient number, since it is larger than the sum of its proper divisors (682134063).

1975944657 is a wasteful number, since it uses less digits than its factorization.

1975944657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6524.

The product of its digits is 9525600, while the sum is 57.

The square root of 1975944657 is about 44451.5990376049. The cubic root of 1975944657 is about 1254.8493561609.

The spelling of 1975944657 in words is "one billion, nine hundred seventy-five million, nine hundred forty-four thousand, six hundred fifty-seven".