155320987563 has 32 divisors (see below), whose sum is σ = 267939187200. Its totient is φ = 87080224608.

The previous prime is 155320987541. The next prime is 155320987579. The reversal of 155320987563 is 365789023551.

155320987563 is a `hidden beast` number, since 1 + 5 + 53 + 20 + 9 + 8 + 7 + 563 = 666.

It is not a de Polignac number, because 155320987563 - 2¹⁸ = 155320725419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155320987513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7742853 + ... + 7762886.

It is an arithmetic number, because the mean of its divisors is an integer number (8373099600).

Almost surely, 2^155320987563 is an apocalyptic number.

155320987563 is a deficient number, since it is larger than the sum of its proper divisors (112618199637).

155320987563 is a wasteful number, since it uses less digits than its factorization.

155320987563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15505808 (or 15505802 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 54.

The spelling of 155320987563 in words is "one hundred fifty-five billion, three hundred twenty million, nine hundred eighty-seven thousand, five hundred sixty-three".