61466642731521 has 12 divisors (see below), whose sum is σ = 88856925204372. Its totient is φ = 40944635086176.

The previous prime is 61466642731519. The next prime is 61466642731553. The reversal of 61466642731521 is 12513724666416.

It can be written as a sum of positive squares in 2 ways, for example, as 43664487783921 + 17802154947600 = 6607911^2 + 4219260^2 .

It is not a de Polignac number, because 61466642731521 - 2¹ = 61466642731519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61466642731121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2760549486 + ... + 2760571751.

It is an arithmetic number, because the mean of its divisors is an integer number (7404743767031).

Almost surely, 2^{61466642731521} is an apocalyptic number.

It is an amenable number.

61466642731521 is a deficient number, since it is larger than the sum of its proper divisors (27390282472851).

61466642731521 is a wasteful number, since it uses less digits than its factorization.

61466642731521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521122480 (or 5521122477 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 61466642731521 in words is "sixty-one trillion, four hundred sixty-six billion, six hundred forty-two million, seven hundred thirty-one thousand, five hundred twenty-one".