11656741987 has 32 divisors (see below), whose sum is σ = 13447627776. Its totient is φ = 10000848000.

The previous prime is 11656741979. The next prime is 11656742029. The reversal of 11656741987 is 78914765611.

It is not a de Polignac number, because 11656741987 - 2³ = 11656741979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11656741907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9530658 + ... + 9531880.

It is an arithmetic number, because the mean of its divisors is an integer number (420238368).

Almost surely, 2^11656741987 is an apocalyptic number.

11656741987 is a deficient number, since it is larger than the sum of its proper divisors (1790885789).

11656741987 is a wasteful number, since it uses less digits than its factorization.

11656741987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731.

The product of its digits is 2540160, while the sum is 55.

The spelling of 11656741987 in words is "eleven billion, six hundred fifty-six million, seven hundred forty-one thousand, nine hundred eighty-seven".