61997710240 has 48 divisors (see below), whose sum is σ = 146686197672. Its totient is φ = 24762409984.

The previous prime is 61997710231. The next prime is 61997710289. The reversal of 61997710240 is 4201779916.

It can be written as a sum of positive squares in 4 ways, for example, as 60577023376 + 1420686864 = 246124^2 + 37692^2 .

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, 177859 + ... + 394498.

Almost surely, 2^61997710240 is an apocalyptic number.

It is an amenable number.

61997710240 is an abundant number, since it is smaller than the sum of its proper divisors (84688487432).

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

61997710240 is a wasteful number, since it uses less digits than its factorization.

61997710240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573049 (or 573041 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 61997710240 in words is "sixty-one billion, nine hundred ninety-seven million, seven hundred ten thousand, two hundred forty".