61405831071 has 24 divisors (see below), whose sum is σ = 95621862336. Its totient is φ = 37747978560.

The previous prime is 61405831057. The next prime is 61405831127. The reversal of 61405831071 is 17013850416.

61405831071 is a `hidden beast` number, since 6 + 1 + 4 + 0 + 583 + 1 + 0 + 71 = 666.

It is not a de Polignac number, because 61405831071 - 2⁶ = 61405831007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61405831031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168775 + ... + 388968.

It is an arithmetic number, because the mean of its divisors is an integer number (3984244264).

Almost surely, 2^61405831071 is an apocalyptic number.

61405831071 is a deficient number, since it is larger than the sum of its proper divisors (34216031265).

61405831071 is a wasteful number, since it uses less digits than its factorization.

61405831071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558703 (or 558700 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 61405831071 in words is "sixty-one billion, four hundred five million, eight hundred thirty-one thousand, seventy-one".