61660247638 has 16 divisors (see below), whose sum is σ = 100902599424. Its totient is φ = 28026270760.

The previous prime is 61660247633. The next prime is 61660247653. The reversal of 61660247638 is 83674206616.

It is a super-2 number, since 2×61660247638² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61660247591 and 61660247600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660247633) 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, 806631 + ... + 879757.

It is an arithmetic number, because the mean of its divisors is an integer number (6306412464).

Almost surely, 2^61660247638 is an apocalyptic number.

61660247638 is a deficient number, since it is larger than the sum of its proper divisors (39242351786).

61660247638 is a wasteful number, since it uses less digits than its factorization.

61660247638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111467.

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 61660247638 in words is "sixty-one billion, six hundred sixty million, two hundred forty-seven thousand, six hundred thirty-eight".