11957609772 has 30 divisors (see below), whose sum is σ = 31259554788. Its totient is φ = 3985869816.

The previous prime is 11957609743. The next prime is 11957609803. The reversal of 11957609772 is 27790675911.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18452778 + ... + 18453425.

Almost surely, 2^11957609772 is an apocalyptic number.

11957609772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11957609772 is an abundant number, since it is smaller than the sum of its proper divisors (19301945016).

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

11957609772 is a wasteful number, since it uses less digits than its factorization.

11957609772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36906219 (or 36906208 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 54.

The spelling of 11957609772 in words is "eleven billion, nine hundred fifty-seven million, six hundred nine thousand, seven hundred seventy-two".