61165712072121 has 16 divisors (see below), whose sum is σ = 81715357267200. Its totient is φ = 40696605797888.

The previous prime is 61165712072117. The next prime is 61165712072131. The reversal of 61165712072121 is 12127021756116.

It is a cyclic number.

It is not a de Polignac number, because 61165712072121 - 2² = 61165712072117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61165712072131) 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, 229675840 + ... + 229941998.

It is an arithmetic number, because the mean of its divisors is an integer number (5107209829200).

Almost surely, 2^{61165712072121} is an apocalyptic number.

It is an amenable number.

61165712072121 is a deficient number, since it is larger than the sum of its proper divisors (20549645195079).

61165712072121 is a wasteful number, since it uses less digits than its factorization.

61165712072121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417168.

The product of its (nonzero) digits is 70560, while the sum is 42.

The spelling of 61165712072121 in words is "sixty-one trillion, one hundred sixty-five billion, seven hundred twelve million, seventy-two thousand, one hundred twenty-one".