155566515501 has 12 divisors (see below), whose sum is σ = 224861222560. Its totient is φ = 103639917960.

The previous prime is 155566515431. The next prime is 155566515509. The reversal of 155566515501 is 105515665551.

It is not a de Polignac number, because 155566515501 - 2¹⁴ = 155566499117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155566515509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5910505 + ... + 5936766.

Almost surely, 2^155566515501 is an apocalyptic number.

It is an amenable number.

155566515501 is a deficient number, since it is larger than the sum of its proper divisors (69294707059).

155566515501 is a wasteful number, since it uses less digits than its factorization.

155566515501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11848736 (or 11848733 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 45.

The spelling of 155566515501 in words is "one hundred fifty-five billion, five hundred sixty-six million, five hundred fifteen thousand, five hundred one".