83078721761 has 16 divisors (see below), whose sum is σ = 103998867840. Its totient is φ = 64710401280.

The previous prime is 83078721721. The next prime is 83078721763. The reversal of 83078721761 is 16712787038.

It is a happy number.

It is not a de Polignac number, because 83078721761 - 2⁶ = 83078721697 is a prime.

It is a super-2 number, since 2×83078721761² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83078721763) 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, 12033455 + ... + 12040356.

It is an arithmetic number, because the mean of its divisors is an integer number (6499929240).

Almost surely, 2^83078721761 is an apocalyptic number.

It is an amenable number.

83078721761 is a deficient number, since it is larger than the sum of its proper divisors (20920146079).

83078721761 is a wasteful number, since it uses less digits than its factorization.

83078721761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24073864.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 83078721761 in words is "eighty-three billion, seventy-eight million, seven hundred twenty-one thousand, seven hundred sixty-one".