155511001320 has 64 divisors (see below), whose sum is σ = 493976128320. Its totient is φ = 39030211584.

The previous prime is 155511001319. The next prime is 155511001339. The reversal of 155511001320 is 23100115551.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 38113402 + ... + 38117481.

It is an arithmetic number, because the mean of its divisors is an integer number (7718377005).

Almost surely, 2^155511001320 is an apocalyptic number.

155511001320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155511001320 is an abundant number, since it is smaller than the sum of its proper divisors (338465127000).

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

155511001320 is a wasteful number, since it uses less digits than its factorization.

155511001320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76230914 (or 76230910 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 155511001320 its reverse (23100115551), we get a palindrome (178611116871).

The spelling of 155511001320 in words is "one hundred fifty-five billion, five hundred eleven million, one thousand, three hundred twenty".