61755272168 has 8 divisors (see below), whose sum is σ = 115791135330. Its totient is φ = 30877636080.

The previous prime is 61755272123. The next prime is 61755272179. The reversal of 61755272168 is 86127255716.

It can be written as a sum of positive squares in only one way, i.e., 61079168164 + 676104004 = 247142^2 + 26002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3859704503 + ... + 3859704518.

Almost surely, 2^61755272168 is an apocalyptic number.

It is an amenable number.

61755272168 is a deficient number, since it is larger than the sum of its proper divisors (54035863162).

61755272168 is a wasteful number, since it uses less digits than its factorization.

61755272168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7719409027 (or 7719409023 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 50.

The spelling of 61755272168 in words is "sixty-one billion, seven hundred fifty-five million, two hundred seventy-two thousand, one hundred sixty-eight".