155649975625 has 45 divisors (see below), whose sum is σ = 199672725681. Its totient is φ = 121292766000.

The previous prime is 155649975619. The next prime is 155649975647. The reversal of 155649975625 is 526579946551.

It is a happy number.

The square root of 155649975625 is 394525.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 12202958089 + 143447017536 = 110467^2 + 378744^2 .

It is not a de Polignac number, because 155649975625 - 2²¹ = 155647878473 is a prime.

It is a Duffinian number.

Its product of digits (102060000) is a multiple of the sum of its prime factors (840).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 424114192 + ... + 424114558.

Almost surely, 2^155649975625 is an apocalyptic number.

155649975625 is the 394525-th square number.

155649975625 is the 197263-rd centered octagonal number.

It is an amenable number.

155649975625 is a deficient number, since it is larger than the sum of its proper divisors (44022750056).

155649975625 is an frugal number, since it uses more digits than its factorization.

155649975625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 415 counting only the distinct ones).

The product of its digits is 102060000, while the sum is 64.

Multiplying 155649975625 by its sum of digits (64), we get a square (9961598440000 = 3156200²).

The spelling of 155649975625 in words is "one hundred fifty-five billion, six hundred forty-nine million, nine hundred seventy-five thousand, six hundred twenty-five".