61644118897767 has 16 divisors (see below), whose sum is σ = 93998543751680. Its totient is φ = 35200967690592.

The previous prime is 61644118897729. The next prime is 61644118897807. The reversal of 61644118897767 is 76779881144616.

It is not a de Polignac number, because 61644118897767 - 2⁸ = 61644118897511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61644118897267) 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, 1010098267 + ... + 1010159292.

It is an arithmetic number, because the mean of its divisors is an integer number (5874908984480).

Almost surely, 2^{61644118897767} is an apocalyptic number.

61644118897767 is a deficient number, since it is larger than the sum of its proper divisors (32354424853913).

61644118897767 is a wasteful number, since it uses less digits than its factorization.

61644118897767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020259022.

The product of its digits is 682795008, while the sum is 75.

The spelling of 61644118897767 in words is "sixty-one trillion, six hundred forty-four billion, one hundred eighteen million, eight hundred ninety-seven thousand, seven hundred sixty-seven".