402165520420 has 12 divisors (see below), whose sum is σ = 844547592924. Its totient is φ = 160866208160.

The previous prime is 402165520391. The next prime is 402165520433. The reversal of 402165520420 is 24025561204.

It can be written as a sum of positive squares in 2 ways, for example, as 89648743396 + 312516777024 = 299414^2 + 559032^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10054137991 + ... + 10054138030.

It is an arithmetic number, because the mean of its divisors is an integer number (70378966077).

Almost surely, 2^402165520420 is an apocalyptic number.

It is an amenable number.

402165520420 is an abundant number, since it is smaller than the sum of its proper divisors (442382072504).

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

402165520420 is a wasteful number, since it uses less digits than its factorization.

402165520420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20108276030 (or 20108276028 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 402165520420 in words is "four hundred two billion, one hundred sixty-five million, five hundred twenty thousand, four hundred twenty".