156555506651091 has 4 divisors (see below), whose sum is σ = 208740675534792. Its totient is φ = 104370337767392.

The previous prime is 156555506651057. The next prime is 156555506651113. The reversal of 156555506651091 is 190156605555651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 156555506651091 - 2⁹ = 156555506650579 is a prime.

It is a super-2 number, since 2×156555506651091² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156555506651041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26092584441846 + ... + 26092584441851.

It is an arithmetic number, because the mean of its divisors is an integer number (52185168883698).

Almost surely, 2^{156555506651091} is an apocalyptic number.

156555506651091 is a deficient number, since it is larger than the sum of its proper divisors (52185168883701).

156555506651091 is an equidigital number, since it uses as much as digits as its factorization.

156555506651091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52185168883700.

The product of its (nonzero) digits is 30375000, while the sum is 60.

The spelling of 156555506651091 in words is "one hundred fifty-six trillion, five hundred fifty-five billion, five hundred six million, six hundred fifty-one thousand, ninety-one".