155724772340 has 24 divisors (see below), whose sum is σ = 327091460640. Its totient is φ = 62276682528.

The previous prime is 155724772297. The next prime is 155724772397. The reversal of 155724772340 is 43277427551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729830 + ... + 918749.

It is an arithmetic number, because the mean of its divisors is an integer number (13628810860).

Almost surely, 2^155724772340 is an apocalyptic number.

155724772340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155724772340 is an abundant number, since it is smaller than the sum of its proper divisors (171366688300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155724772340 is a wasteful number, since it uses less digits than its factorization.

155724772340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653311 (or 1653309 counting only the distinct ones).

The product of its (nonzero) digits is 1646400, while the sum is 47.

The spelling of 155724772340 in words is "one hundred fifty-five billion, seven hundred twenty-four million, seven hundred seventy-two thousand, three hundred forty".