15645461772 has 12 divisors (see below), whose sum is σ = 36506077496. Its totient is φ = 5215153920.

The previous prime is 15645461759. The next prime is 15645461779. The reversal of 15645461772 is 27716454651.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×15645461772² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (15645461779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651894229 + ... + 651894252.

Almost surely, 2^15645461772 is an apocalyptic number.

15645461772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15645461772 is an abundant number, since it is smaller than the sum of its proper divisors (20860615724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15645461772 is a wasteful number, since it uses less digits than its factorization.

15645461772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303788488 (or 1303788486 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The spelling of 15645461772 in words is "fifteen billion, six hundred forty-five million, four hundred sixty-one thousand, seven hundred seventy-two".