155021551320 has 32 divisors (see below), whose sum is σ = 465064654320. Its totient is φ = 41339080320.

The previous prime is 155021551319. The next prime is 155021551367. The reversal of 155021551320 is 23155120551.

155021551320 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 645923011 + ... + 645923250.

Almost surely, 2^155021551320 is an apocalyptic number.

155021551320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155021551320 is an abundant number, since it is smaller than the sum of its proper divisors (310043103000).

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

155021551320 is a wasteful number, since it uses less digits than its factorization.

155021551320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291846275 (or 1291846271 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 155021551320 its reverse (23155120551), we get a palindrome (178176671871).

The spelling of 155021551320 in words is "one hundred fifty-five billion, twenty-one million, five hundred fifty-one thousand, three hundred twenty".