61319494656 has 396 divisors, whose sum is σ = 213644603952. Its totient is φ = 16591454208.

The previous prime is 61319494633. The next prime is 61319494661. The reversal of 61319494656 is 65649491316.

It is a happy number.

61319494656 is a `hidden beast` number, since 6 + 131 + 9 + 49 + 465 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23287516 + ... + 23290148.

Almost surely, 2^61319494656 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 61319494656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106822301976).

61319494656 is an abundant number, since it is smaller than the sum of its proper divisors (152325109296).

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

61319494656 is a wasteful number, since it uses less digits than its factorization.

61319494656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704 (or 2664 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 61319494656 in words is "sixty-one billion, three hundred nineteen million, four hundred ninety-four thousand, six hundred fifty-six".