61611646215772 has 12 divisors (see below), whose sum is σ = 107831057290600. Its totient is φ = 30802772704176.

The previous prime is 61611646215751. The next prime is 61611646215773. The reversal of 61611646215772 is 27751264611616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61611646215773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762555483 + ... + 762636274.

Almost surely, 2^{61611646215772} is an apocalyptic number.

It is an amenable number.

61611646215772 is a deficient number, since it is larger than the sum of its proper divisors (46219411074828).

61611646215772 is a wasteful number, since it uses less digits than its factorization.

61611646215772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525201860 (or 1525201858 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 55.

The spelling of 61611646215772 in words is "sixty-one trillion, six hundred eleven billion, six hundred forty-six million, two hundred fifteen thousand, seven hundred seventy-two".