61808817402 has 48 divisors (see below), whose sum is σ = 134602490880. Its totient is φ = 20497968000.

The previous prime is 61808817397. The next prime is 61808817419. The reversal of 61808817402 is 20471880816.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4986849 + ... + 4999227.

It is an arithmetic number, because the mean of its divisors is an integer number (2804218560).

Almost surely, 2^61808817402 is an apocalyptic number.

61808817402 is an abundant number, since it is smaller than the sum of its proper divisors (72793673478).

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

61808817402 is a wasteful number, since it uses less digits than its factorization.

61808817402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13779 (or 13776 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 61808817402 in words is "sixty-one billion, eight hundred eight million, eight hundred seventeen thousand, four hundred two".