61439713937 has 6 divisors (see below), whose sum is σ = 71470687698. Its totient is φ = 52662611904.

The previous prime is 61439713921. The next prime is 61439713943. The reversal of 61439713937 is 73931793416.

It can be written as a sum of positive squares in only one way, i.e., 41342682241 + 20097031696 = 203329^2 + 141764^2 .

It is not a de Polignac number, because 61439713937 - 2⁴ = 61439713921 is a prime.

It is a super-3 number, since 3×61439713937³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61439713997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 626935808 + ... + 626935905.

It is an arithmetic number, because the mean of its divisors is an integer number (11911781283).

Almost surely, 2^61439713937 is an apocalyptic number.

It is an amenable number.

61439713937 is a deficient number, since it is larger than the sum of its proper divisors (10030973761).

61439713937 is a wasteful number, since it uses less digits than its factorization.

61439713937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253871727 (or 1253871720 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 53.

The spelling of 61439713937 in words is "sixty-one billion, four hundred thirty-nine million, seven hundred thirteen thousand, nine hundred thirty-seven".