61508709871 has 16 divisors (see below), whose sum is σ = 70641607680. Its totient is φ = 52462692000.

The previous prime is 61508709863. The next prime is 61508709877. The reversal of 61508709871 is 17890780516.

It is a cyclic number.

It is not a de Polignac number, because 61508709871 - 2³ = 61508709863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61508709877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1932730 + ... + 1964296.

It is an arithmetic number, because the mean of its divisors is an integer number (4415100480).

Almost surely, 2^61508709871 is an apocalyptic number.

61508709871 is a deficient number, since it is larger than the sum of its proper divisors (9132897809).

61508709871 is a wasteful number, since it uses less digits than its factorization.

61508709871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32934.

The product of its (nonzero) digits is 846720, while the sum is 52.

The spelling of 61508709871 in words is "sixty-one billion, five hundred eight million, seven hundred nine thousand, eight hundred seventy-one".