61239421156 has 9 divisors (see below), whose sum is σ = 107169853161. Its totient is φ = 30619463112.

The previous prime is 61239421091. The next prime is 61239421163. The reversal of 61239421156 is 65112493216.

The square root of 61239421156 is 247466.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 49786996900 + 11452424256 = 223130^2 + 107016^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 433066 + ... + 556798.

Almost surely, 2^61239421156 is an apocalyptic number.

61239421156 is the 247466-th square number.

It is an amenable number.

61239421156 is a deficient number, since it is larger than the sum of its proper divisors (45930432005).

61239421156 is an frugal number, since it uses more digits than its factorization.

61239421156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247470 (or 123735 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The spelling of 61239421156 in words is "sixty-one billion, two hundred thirty-nine million, four hundred twenty-one thousand, one hundred fifty-six".