61438615768 has 16 divisors (see below), whose sum is σ = 115204288680. Its totient is φ = 30717472128.

The previous prime is 61438615759. The next prime is 61438615781. The reversal of 61438615768 is 86751683416.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81630 + ... + 359917.

Almost surely, 2^61438615768 is an apocalyptic number.

It is an amenable number.

61438615768 is a deficient number, since it is larger than the sum of its proper divisors (53765672912).

61438615768 is a wasteful number, since it uses less digits than its factorization.

61438615768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458946 (or 458942 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 61438615768 in words is "sixty-one billion, four hundred thirty-eight million, six hundred fifteen thousand, seven hundred sixty-eight".