1618542621 has 16 divisors (see below), whose sum is σ = 2400203520. Its totient is φ = 1077965280.

The previous prime is 1618542593. The next prime is 1618542623. The reversal of 1618542621 is 1262458161.

It is a happy number.

1618542621 is a `hidden beast` number, since 16 + 18 + 5 + 4 + 2 + 621 = 666.

It is not a de Polignac number, because 1618542621 - 2³⁰ = 544800797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618542623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125 + ... + 56906.

It is an arithmetic number, because the mean of its divisors is an integer number (150012720).

Almost surely, 2^1618542621 is an apocalyptic number.

It is an amenable number.

1618542621 is a deficient number, since it is larger than the sum of its proper divisors (781660899).

1618542621 is a wasteful number, since it uses less digits than its factorization.

1618542621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59073 (or 59067 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1618542621 is about 40231.1150852173. The cubic root of 1618542621 is about 1174.1079986687.

The spelling of 1618542621 in words is "one billion, six hundred eighteen million, five hundred forty-two thousand, six hundred twenty-one".