61916678660 has 24 divisors (see below), whose sum is σ = 132478329816. Its totient is φ = 24299375360.

The previous prime is 61916678651. The next prime is 61916678669. The reversal of 61916678660 is 6687661916.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61916678651) and next prime (61916678669).

It can be written as a sum of positive squares in 4 ways, for example, as 2548432324 + 59368246336 = 50482^2 + 243656^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61916678596 and 61916678605.

It is not an unprimeable number, because it can be changed into a prime (61916678669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29204921 + ... + 29207040.

It is an arithmetic number, because the mean of its divisors is an integer number (5519930409).

Almost surely, 2^61916678660 is an apocalyptic number.

It is an amenable number.

61916678660 is an abundant number, since it is smaller than the sum of its proper divisors (70561651156).

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

61916678660 is a wasteful number, since it uses less digits than its factorization.

61916678660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58412023 (or 58412021 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 61916678660 in words is "sixty-one billion, nine hundred sixteen million, six hundred seventy-eight thousand, six hundred sixty".