61771370157 has 12 divisors (see below), whose sum is σ = 101971785760. Its totient is φ = 35297925768.

The previous prime is 61771370149. The next prime is 61771370161. The reversal of 61771370157 is 75107317716.

61771370157 is a `hidden beast` number, since 61 + 7 + 71 + 370 + 157 = 666.

It is not a de Polignac number, because 61771370157 - 2³ = 61771370149 is a prime.

It is a super-2 number, since 2×61771370157² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771370147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490248907 + ... + 490249032.

Almost surely, 2^61771370157 is an apocalyptic number.

It is an amenable number.

61771370157 is a deficient number, since it is larger than the sum of its proper divisors (40200415603).

61771370157 is a wasteful number, since it uses less digits than its factorization.

61771370157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980497952 (or 980497949 counting only the distinct ones).

The product of its (nonzero) digits is 216090, while the sum is 45.

The spelling of 61771370157 in words is "sixty-one billion, seven hundred seventy-one million, three hundred seventy thousand, one hundred fifty-seven".