61251917139 has 12 divisors (see below), whose sum is σ = 101114276016. Its totient is φ = 35001095472.

The previous prime is 61251917131. The next prime is 61251917143. The reversal of 61251917139 is 93171915216.

61251917139 is a `hidden beast` number, since 61 + 2 + 519 + 1 + 71 + 3 + 9 = 666.

It is not a de Polignac number, because 61251917139 - 2³ = 61251917131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61251917094 and 61251917103.

It is not an unprimeable number, because it can be changed into a prime (61251917131) 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 11 ways as a sum of consecutive naturals, for example, 486126264 + ... + 486126389.

It is an arithmetic number, because the mean of its divisors is an integer number (8426189668).

Almost surely, 2^61251917139 is an apocalyptic number.

61251917139 is a deficient number, since it is larger than the sum of its proper divisors (39862358877).

61251917139 is a wasteful number, since it uses less digits than its factorization.

61251917139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972252666 (or 972252663 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The spelling of 61251917139 in words is "sixty-one billion, two hundred fifty-one million, nine hundred seventeen thousand, one hundred thirty-nine".