61979167525821 has 64 divisors (see below), whose sum is σ = 104525768256000. Its totient is φ = 31788189213696.

The previous prime is 61979167525819. The next prime is 61979167525853. The reversal of 61979167525821 is 12852576197916.

It is not a de Polignac number, because 61979167525821 - 2¹ = 61979167525819 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61979167523821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13665835 + ... + 17627063.

It is an arithmetic number, because the mean of its divisors is an integer number (1633215129000).

Almost surely, 2^{61979167525821} is an apocalyptic number.

It is an amenable number.

61979167525821 is a deficient number, since it is larger than the sum of its proper divisors (42546600730179).

61979167525821 is a wasteful number, since it uses less digits than its factorization.

61979167525821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962838.

The product of its digits is 114307200, while the sum is 69.

The spelling of 61979167525821 in words is "sixty-one trillion, nine hundred seventy-nine billion, one hundred sixty-seven million, five hundred twenty-five thousand, eight hundred twenty-one".