61961315808 has 48 divisors (see below), whose sum is σ = 185883949440. Its totient is φ = 17703232896.

The previous prime is 61961315789. The next prime is 61961315827. The reversal of 61961315808 is 80851316916.

It is an interprime number because it is at equal distance from previous prime (61961315789) and next prime (61961315827).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46101498 + ... + 46102841.

It is an arithmetic number, because the mean of its divisors is an integer number (3872582280).

Almost surely, 2^61961315808 is an apocalyptic number.

It is an amenable number.

61961315808 is an abundant number, since it is smaller than the sum of its proper divisors (123922633632).

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

61961315808 is a wasteful number, since it uses less digits than its factorization.

61961315808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92204359 (or 92204351 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 61961315808 in words is "sixty-one billion, nine hundred sixty-one million, three hundred fifteen thousand, eight hundred eight".