65981347775 has 12 divisors (see below), whose sum is σ = 93504995952. Its totient is φ = 45244352640.

The previous prime is 65981347769. The next prime is 65981347793. The reversal of 65981347775 is 57774318956.

It is a happy number.

It is not a de Polignac number, because 65981347775 - 2⁴ = 65981347759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188517962 + ... + 188518311.

It is an arithmetic number, because the mean of its divisors is an integer number (7792082996).

Almost surely, 2^65981347775 is an apocalyptic number.

65981347775 is a deficient number, since it is larger than the sum of its proper divisors (27523648177).

65981347775 is a wasteful number, since it uses less digits than its factorization.

65981347775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377036290 (or 377036285 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 62.

The spelling of 65981347775 in words is "sixty-five billion, nine hundred eighty-one million, three hundred forty-seven thousand, seven hundred seventy-five".