10161611581 has 12 divisors (see below), whose sum is σ = 11194876000. Its totient is φ = 9216737640.

The previous prime is 10161611567. The next prime is 10161611627. The reversal of 10161611581 is 18511616101.

It is a happy number.

It is not a de Polignac number, because 10161611581 - 2²⁷ = 10027393853 is a prime.

It is a super-2 number, since 2×10161611581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10161611561) 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, 42531 + ... + 148768.

Almost surely, 2^10161611581 is an apocalyptic number.

10161611581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10161611581 is a deficient number, since it is larger than the sum of its proper divisors (1033264419).

10161611581 is a wasteful number, since it uses less digits than its factorization.

10161611581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191760 (or 191749 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 31.

The spelling of 10161611581 in words is "ten billion, one hundred sixty-one million, six hundred eleven thousand, five hundred eighty-one".