61917875659 has 4 divisors (see below), whose sum is σ = 65176711240. Its totient is φ = 58659040080.

The previous prime is 61917875647. The next prime is 61917875687. The reversal of 61917875659 is 95657871916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61917875659 - 2¹³ = 61917867467 is a prime.

It is a super-2 number, since 2×61917875659² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61917875659.

It is not an unprimeable number, because it can be changed into a prime (61917875639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629417762 + ... + 1629417799.

It is an arithmetic number, because the mean of its divisors is an integer number (16294177810).

Almost surely, 2^61917875659 is an apocalyptic number.

61917875659 is a deficient number, since it is larger than the sum of its proper divisors (3258835581).

61917875659 is a wasteful number, since it uses less digits than its factorization.

61917875659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258835580.

The product of its digits is 28576800, while the sum is 64.

The spelling of 61917875659 in words is "sixty-one billion, nine hundred seventeen million, eight hundred seventy-five thousand, six hundred fifty-nine".