11865601356 has 24 divisors (see below), whose sum is σ = 31641603840. Its totient is φ = 3390171792.

The previous prime is 11865601313. The next prime is 11865601381. The reversal of 11865601356 is 65310656811.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70628496 + ... + 70628663.

It is an arithmetic number, because the mean of its divisors is an integer number (1318400160).

Almost surely, 2^11865601356 is an apocalyptic number.

It is an amenable number.

11865601356 is an abundant number, since it is smaller than the sum of its proper divisors (19776002484).

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

11865601356 is a wasteful number, since it uses less digits than its factorization.

11865601356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141257173 (or 141257171 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 11865601356 in words is "eleven billion, eight hundred sixty-five million, six hundred one thousand, three hundred fifty-six".