153139951561 has 3 divisors (see below), whose sum is σ = 153140342893. Its totient is φ = 153139560230.

The previous prime is 153139951537. The next prime is 153139951603. The reversal of 153139951561 is 165159931351.

The square root of 153139951561 is 391331.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 153139951561 - 2¹⁵ = 153139918793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153133951561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 195666 + ... + 586996.

Almost surely, 2^153139951561 is an apocalyptic number.

153139951561 is the 391331-st square number.

153139951561 is the 195666-th centered octagonal number.

It is an amenable number.

153139951561 is a deficient number, since it is larger than the sum of its proper divisors (391332).

153139951561 is an frugal number, since it uses more digits than its factorization.

153139951561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782662 (or 391331 counting only the distinct ones).

The product of its digits is 546750, while the sum is 49.

Multiplying 153139951561 by its sum of digits (49), we get a square (7503857626489 = 2739317²).

The spelling of 153139951561 in words is "one hundred fifty-three billion, one hundred thirty-nine million, nine hundred fifty-one thousand, five hundred sixty-one".