11972620854 has 20 divisors (see below), whose sum is σ = 26827539684. Its totient is φ = 3990873564.

The previous prime is 11972620789. The next prime is 11972620883. The reversal of 11972620854 is 45802627911.

11972620854 is a `hidden beast` number, since 1 + 19 + 7 + 2 + 620 + 8 + 5 + 4 = 666.

It is a super-2 number, since 2×11972620854² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36952372 + ... + 36952695.

Almost surely, 2^11972620854 is an apocalyptic number.

11972620854 is an abundant number, since it is smaller than the sum of its proper divisors (14854918830).

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

11972620854 is an equidigital number, since it uses as much as digits as its factorization.

11972620854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73905081 (or 73905072 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 11972620854 in words is "eleven billion, nine hundred seventy-two million, six hundred twenty thousand, eight hundred fifty-four".