155311090816 has 128 divisors (see below), whose sum is σ = 362601970560. Its totient is φ = 64888750080.

The previous prime is 155311090787. The next prime is 155311090897. The reversal of 155311090816 is 618090113551.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6163555 + ... + 6188701.

It is an arithmetic number, because the mean of its divisors is an integer number (2832827895).

Almost surely, 2^155311090816 is an apocalyptic number.

155311090816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155311090816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181300985280).

155311090816 is an abundant number, since it is smaller than the sum of its proper divisors (207290879744).

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

155311090816 is a wasteful number, since it uses less digits than its factorization.

155311090816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25342 (or 25330 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 155311090816 in words is "one hundred fifty-five billion, three hundred eleven million, ninety thousand, eight hundred sixteen".