61647978826 has 16 divisors (see below), whose sum is σ = 106124440320. Its totient is φ = 26310014640.

The previous prime is 61647978811. The next prime is 61647978841. The reversal of 61647978826 is 62887974616.

It is an interprime number because it is at equal distance from previous prime (61647978811) and next prime (61647978841).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9208845 + ... + 9215536.

It is an arithmetic number, because the mean of its divisors is an integer number (6632777520).

Almost surely, 2^61647978826 is an apocalyptic number.

61647978826 is a deficient number, since it is larger than the sum of its proper divisors (44476461494).

61647978826 is a wasteful number, since it uses less digits than its factorization.

61647978826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18424629.

The product of its digits is 48771072, while the sum is 64.

The spelling of 61647978826 in words is "sixty-one billion, six hundred forty-seven million, nine hundred seventy-eight thousand, eight hundred twenty-six".