1623137681 has 12 divisors (see below), whose sum is σ = 1878013200. Its totient is φ = 1397915640.

The previous prime is 1623137653. The next prime is 1623137687. The reversal of 1623137681 is 1867313261.

It is a de Polignac number, because none of the positive numbers 2^k-1623137681 is a prime.

It is a super-2 number, since 2×1623137681² = 5269151862964115522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1623137687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350711 + ... + 355308.

It is an arithmetic number, because the mean of its divisors is an integer number (156501100).

Almost surely, 2^1623137681 is an apocalyptic number.

1623137681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1623137681 is a deficient number, since it is larger than the sum of its proper divisors (254875519).

1623137681 is a wasteful number, since it uses less digits than its factorization.

1623137681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706060 (or 706049 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 1623137681 is about 40288.1828952362. The cubic root of 1623137681 is about 1175.2180506147.

The spelling of 1623137681 in words is "one billion, six hundred twenty-three million, one hundred thirty-seven thousand, six hundred eighty-one".