155725791780864 has 1344 divisors, whose sum is σ = 489483651317760. Its totient is φ = 43818827120640.

The previous prime is 155725791780857. The next prime is 155725791780869. The reversal of 155725791780864 is 468087197527551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155725791780869) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 406594756417 + ... + 406594756799.

Almost surely, 2^{155725791780864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155725791780864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244741825658880).

155725791780864 is an abundant number, since it is smaller than the sum of its proper divisors (333757859536896).

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

155725791780864 is a wasteful number, since it uses less digits than its factorization.

155725791780864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 1185408000, while the sum is 75.

The spelling of 155725791780864 in words is "one hundred fifty-five trillion, seven hundred twenty-five billion, seven hundred ninety-one million, seven hundred eighty thousand, eight hundred sixty-four".