11978860953691 has 16 divisors (see below), whose sum is σ = 12212955619200. Its totient is φ = 11746801847808.

The previous prime is 11978860953551. The next prime is 11978860953733. The reversal of 11978860953691 is 19635906887911.

It is a cyclic number.

It is not a de Polignac number, because 11978860953691 - 2⁹ = 11978860953179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978860953091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11521215 + ... + 12517831.

It is an arithmetic number, because the mean of its divisors is an integer number (763309726200).

Almost surely, 2^{11978860953691} is an apocalyptic number.

11978860953691 is a deficient number, since it is larger than the sum of its proper divisors (234094665509).

11978860953691 is an equidigital number, since it uses as much as digits as its factorization.

11978860953691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997638.

The product of its (nonzero) digits is 176359680, while the sum is 73.

The spelling of 11978860953691 in words is "eleven trillion, nine hundred seventy-eight billion, eight hundred sixty million, nine hundred fifty-three thousand, six hundred ninety-one".