61256848978 has 36 divisors (see below), whose sum is σ = 100685573370. Its totient is φ = 27935134656.

The previous prime is 61256848931. The next prime is 61256849029. The reversal of 61256848978 is 87984865216.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20772592129 + 40484256849 = 144127^2 + 201207^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 42926301 + ... + 42927727.

Almost surely, 2^61256848978 is an apocalyptic number.

61256848978 is a deficient number, since it is larger than the sum of its proper divisors (39428724392).

61256848978 is an equidigital number, since it uses as much as digits as its factorization.

61256848978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971 (or 1531 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 64.

The spelling of 61256848978 in words is "sixty-one billion, two hundred fifty-six million, eight hundred forty-eight thousand, nine hundred seventy-eight".