355997539820 has 72 divisors (see below), whose sum is σ = 810947343024. Its totient is φ = 130497754752.

The previous prime is 355997539787. The next prime is 355997539829. The reversal of 355997539820 is 28935799553.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is not an unprimeable number, because it can be changed into a prime (355997539829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4988027 + ... + 5058893.

It is an arithmetic number, because the mean of its divisors is an integer number (11263157542).

Almost surely, 2^355997539820 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 355997539820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405473671512).

355997539820 is an abundant number, since it is smaller than the sum of its proper divisors (454949803204).

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

355997539820 is a wasteful number, since it uses less digits than its factorization.

355997539820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71167 (or 71026 counting only the distinct ones).

The product of its (nonzero) digits is 91854000, while the sum is 65.

The spelling of 355997539820 in words is "three hundred fifty-five billion, nine hundred ninety-seven million, five hundred thirty-nine thousand, eight hundred twenty".