155506561651 has 24 divisors (see below), whose sum is σ = 192821925600. Its totient is φ = 124608621312.

The previous prime is 155506561649. The next prime is 155506561741. The reversal of 155506561651 is 156165605551.

It is a happy number.

155506561651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155506561651 - 2¹ = 155506561649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155506561601) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 502335 + ... + 750568.

It is an arithmetic number, because the mean of its divisors is an integer number (8034246900).

Almost surely, 2^155506561651 is an apocalyptic number.

155506561651 is a deficient number, since it is larger than the sum of its proper divisors (37315363949).

155506561651 is a wasteful number, since it uses less digits than its factorization.

155506561651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253083 (or 1253076 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 155506561651 in words is "one hundred fifty-five billion, five hundred six million, five hundred sixty-one thousand, six hundred fifty-one".