61731602665 has 16 divisors (see below), whose sum is σ = 78446359440. Its totient is φ = 46473799680.

The previous prime is 61731602587. The next prime is 61731602671. The reversal of 61731602665 is 56620613716.

It can be written as a sum of positive squares in 8 ways, for example, as 4302835216 + 57428767449 = 65596^2 + 239643^2 .

It is not a de Polignac number, because 61731602665 - 2³¹ = 59584119017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615445 + ... + 708685.

It is an arithmetic number, because the mean of its divisors is an integer number (4902897465).

Almost surely, 2^61731602665 is an apocalyptic number.

It is an amenable number.

61731602665 is a deficient number, since it is larger than the sum of its proper divisors (16714756775).

61731602665 is a wasteful number, since it uses less digits than its factorization.

61731602665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101052.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 61731602665 in words is "sixty-one billion, seven hundred thirty-one million, six hundred two thousand, six hundred sixty-five".