65660639742 has 48 divisors (see below), whose sum is σ = 147575675520. Its totient is φ = 21880665432.

The previous prime is 65660639731. The next prime is 65660639771. The reversal of 65660639742 is 24793606656.

65660639742 is a `hidden beast` number, since 6 + 566 + 0 + 6 + 3 + 9 + 74 + 2 = 666.

It is a super-2 number, since 2×65660639742² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1889359 + ... + 1923797.

It is an arithmetic number, because the mean of its divisors is an integer number (3074493240).

Almost surely, 2^65660639742 is an apocalyptic number.

65660639742 is an abundant number, since it is smaller than the sum of its proper divisors (81915035778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65660639742 is a wasteful number, since it uses less digits than its factorization.

65660639742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38379 (or 38367 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

The spelling of 65660639742 in words is "sixty-five billion, six hundred sixty million, six hundred thirty-nine thousand, seven hundred forty-two".