61211508877257 has 16 divisors (see below), whose sum is σ = 81967573741248. Its totient is φ = 40631566625280.

The previous prime is 61211508877217. The next prime is 61211508877319. The reversal of 61211508877257 is 75277880511216.

It is not a de Polignac number, because 61211508877257 - 2¹⁶ = 61211508811721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61211508877257.

It is not an unprimeable number, because it can be changed into a prime (61211508877217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29010558 + ... + 31048920.

It is an arithmetic number, because the mean of its divisors is an integer number (5122973358828).

Almost surely, 2^{61211508877257} is an apocalyptic number.

It is an amenable number.

61211508877257 is a deficient number, since it is larger than the sum of its proper divisors (20756064863991).

61211508877257 is a wasteful number, since it uses less digits than its factorization.

61211508877257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081560.

The product of its (nonzero) digits is 13171200, while the sum is 60.

The spelling of 61211508877257 in words is "sixty-one trillion, two hundred eleven billion, five hundred eight million, eight hundred seventy-seven thousand, two hundred fifty-seven".