61611113221521 has 16 divisors (see below), whose sum is σ = 84059157236736. Its totient is φ = 40118585620176.

The previous prime is 61611113221519. The next prime is 61611113221547. The reversal of 61611113221521 is 12512231111616.

It is not a de Polignac number, because 61611113221521 - 2¹ = 61611113221519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61611113221561) 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, 17861676 + ... + 21030018.

It is an arithmetic number, because the mean of its divisors is an integer number (5253697327296).

Almost surely, 2^{61611113221521} is an apocalyptic number.

It is an amenable number.

61611113221521 is a deficient number, since it is larger than the sum of its proper divisors (22448044015215).

61611113221521 is a wasteful number, since it uses less digits than its factorization.

61611113221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319132.

The product of its digits is 4320, while the sum is 33.

The spelling of 61611113221521 in words is "sixty-one trillion, six hundred eleven billion, one hundred thirteen million, two hundred twenty-one thousand, five hundred twenty-one".