61399350264 has 128 divisors (see below), whose sum is σ = 185260400640. Its totient is φ = 16577692032.

The previous prime is 61399350253. The next prime is 61399350283. The reversal of 61399350264 is 46205399316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224989 + ... + 416435.

It is an arithmetic number, because the mean of its divisors is an integer number (1447346880).

Almost surely, 2^61399350264 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 61399350264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92630200320).

61399350264 is an abundant number, since it is smaller than the sum of its proper divisors (123861050376).

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

61399350264 is a wasteful number, since it uses less digits than its factorization.

61399350264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191569 (or 191565 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 48.

The spelling of 61399350264 in words is "sixty-one billion, three hundred ninety-nine million, three hundred fifty thousand, two hundred sixty-four".