11860891655621 has 32 divisors (see below), whose sum is σ = 13024082534400. Its totient is φ = 10762933104000.

The previous prime is 11860891655603. The next prime is 11860891655651. The reversal of 11860891655621 is 12655619806811.

It is a cyclic number.

It is not a de Polignac number, because 11860891655621 - 2¹⁰ = 11860891654597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11860891655651) 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, 12770216 + ... + 13667486.

It is an arithmetic number, because the mean of its divisors is an integer number (407002579200).

Almost surely, 2^{11860891655621} is an apocalyptic number.

It is an amenable number.

11860891655621 is a deficient number, since it is larger than the sum of its proper divisors (1163190878779).

11860891655621 is a wasteful number, since it uses less digits than its factorization.

11860891655621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897641.

The product of its (nonzero) digits is 6220800, while the sum is 59.

The spelling of 11860891655621 in words is "eleven trillion, eight hundred sixty billion, eight hundred ninety-one million, six hundred fifty-five thousand, six hundred twenty-one".