61549566659361 has 48 divisors (see below), whose sum is σ = 97251296201280. Its totient is φ = 37201306181760.

The previous prime is 61549566659327. The next prime is 61549566659377. The reversal of 61549566659361 is 16395666594516.

It is not a de Polignac number, because 61549566659361 - 2⁶ = 61549566659297 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61549566659361.

It is not an unprimeable number, because it can be changed into a prime (61549566659381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63567655 + ... + 64528643.

It is an arithmetic number, because the mean of its divisors is an integer number (2026068670860).

Almost surely, 2^{61549566659361} is an apocalyptic number.

It is an amenable number.

61549566659361 is a deficient number, since it is larger than the sum of its proper divisors (35701729541919).

61549566659361 is a wasteful number, since it uses less digits than its factorization.

61549566659361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962766 (or 962763 counting only the distinct ones).

The product of its digits is 944784000, while the sum is 72.

The spelling of 61549566659361 in words is "sixty-one trillion, five hundred forty-nine billion, five hundred sixty-six million, six hundred fifty-nine thousand, three hundred sixty-one".