61865400651420 has 48 divisors (see below), whose sum is σ = 173459442713760. Its totient is φ = 16474933422336.

The previous prime is 61865400651403. The next prime is 61865400651463. The reversal of 61865400651420 is 2415600456816.

It is a self number, because there is not a number n which added to its sum of digits gives 61865400651420.

It is a congruent number.

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, 703291635 + ... + 703379594.

It is an arithmetic number, because the mean of its divisors is an integer number (3613738389870).

Almost surely, 2^{61865400651420} is an apocalyptic number.

61865400651420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61865400651420 is an abundant number, since it is smaller than the sum of its proper divisors (111594042062340).

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

61865400651420 is a wasteful number, since it uses less digits than its factorization.

61865400651420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406671974 (or 1406671972 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 61865400651420 in words is "sixty-one trillion, eight hundred sixty-five billion, four hundred million, six hundred fifty-one thousand, four hundred twenty".