83940784657 has 16 divisors (see below), whose sum is σ = 88609646080. Its totient is φ = 79410844800.

The previous prime is 83940784637. The next prime is 83940784663. The reversal of 83940784657 is 75648704938.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 83940784657 - 2¹⁵ = 83940751889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a junction number, because it is equal to n+sod(n) for n = 83940784595 and 83940784604.

It is not an unprimeable number, because it can be changed into a prime (83940784607) 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, 172069 + ... + 444397.

It is an arithmetic number, because the mean of its divisors is an integer number (5538102880).

Almost surely, 2^83940784657 is an apocalyptic number.

It is an amenable number.

83940784657 is a deficient number, since it is larger than the sum of its proper divisors (4668861423).

83940784657 is a wasteful number, since it uses less digits than its factorization.

83940784657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272584.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 83940784657 in words is "eighty-three billion, nine hundred forty million, seven hundred eighty-four thousand, six hundred fifty-seven".