12155506572 has 48 divisors (see below), whose sum is σ = 31197043584. Its totient is φ = 3683482000.

The previous prime is 12155506567. The next prime is 12155506579. The reversal of 12155506572 is 27560555121.

It is a self number, because there is not a number n which added to its sum of digits gives 12155506572.

It is not an unprimeable number, because it can be changed into a prime (12155506579) 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, 364554 + ... + 396497.

It is an arithmetic number, because the mean of its divisors is an integer number (649938408).

Almost surely, 2^12155506572 is an apocalyptic number.

12155506572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12155506572 is an abundant number, since it is smaller than the sum of its proper divisors (19041537012).

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

12155506572 is a wasteful number, since it uses less digits than its factorization.

12155506572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761091 (or 761067 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The spelling of 12155506572 in words is "twelve billion, one hundred fifty-five million, five hundred six thousand, five hundred seventy-two".