155779814320 has 80 divisors (see below), whose sum is σ = 390442510080. Its totient is φ = 57460626432.

The previous prime is 155779814317. The next prime is 155779814387. The reversal of 155779814320 is 23418977551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 961761 + ... + 1111999.

It is an arithmetic number, because the mean of its divisors is an integer number (4880531376).

Almost surely, 2^155779814320 is an apocalyptic number.

155779814320 is a gapful number since it is divisible by the number (10) 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 155779814320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195221255040).

155779814320 is an abundant number, since it is smaller than the sum of its proper divisors (234662695760).

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

155779814320 is a wasteful number, since it uses less digits than its factorization.

155779814320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151262 (or 151256 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 155779814320 in words is "one hundred fifty-five billion, seven hundred seventy-nine million, eight hundred fourteen thousand, three hundred twenty".