11662881400665 has 128 divisors (see below), whose sum is σ = 23119329484800. Its totient is φ = 5530966571520.

The previous prime is 11662881400657. The next prime is 11662881400693. The reversal of 11662881400665 is 56600418826611.

It is a happy number.

11662881400665 is a `hidden beast` number, since 1 + 1 + 6 + 628 + 8 + 1 + 4 + 0 + 0 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 11662881400665 - 2³ = 11662881400657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12088149 + ... + 13017261.

It is an arithmetic number, because the mean of its divisors is an integer number (180619761600).

Almost surely, 2^{11662881400665} is an apocalyptic number.

11662881400665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11662881400665 is a deficient number, since it is larger than the sum of its proper divisors (11456448084135).

11662881400665 is a wasteful number, since it uses less digits than its factorization.

11662881400665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929324 (or 929318 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 11662881400665 in words is "eleven trillion, six hundred sixty-two billion, eight hundred eighty-one million, four hundred thousand, six hundred sixty-five".