155496937561 has 9 divisors (see below), whose sum is σ = 180887403711. Its totient is φ = 133280723352.

The previous prime is 155496937511. The next prime is 155496937571. The reversal of 155496937561 is 165739694551.

The square root of 155496937561 is 394331.

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

It can be written as a sum of positive squares in only one way, i.e., 2425070025 + 153071867536 = 49245^2 + 391244^2 .

It is not a de Polignac number, because 155496937561 - 2¹³ = 155496929369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155496937561.

It is not an unprimeable number, because it can be changed into a prime (155496937511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2732151 + ... + 2788483.

Almost surely, 2^155496937561 is an apocalyptic number.

155496937561 is the 394331-st square number.

155496937561 is the 197166-th centered octagonal number.

It is an amenable number.

155496937561 is a deficient number, since it is larger than the sum of its proper divisors (25390466150).

155496937561 is an frugal number, since it uses more digits than its factorization.

155496937561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112680 (or 56340 counting only the distinct ones).

The product of its digits is 30618000, while the sum is 61.

The spelling of 155496937561 in words is "one hundred fifty-five billion, four hundred ninety-six million, nine hundred thirty-seven thousand, five hundred sixty-one".