83971021604 has 6 divisors (see below), whose sum is σ = 146949287814. Its totient is φ = 41985510800.

The previous prime is 83971021579. The next prime is 83971021619. The reversal of 83971021604 is 40612017938.

It can be written as a sum of positive squares in only one way, i.e., 56215461604 + 27755560000 = 237098^2 + 166600^2 .

It is a super-2 number, since 2×83971021604² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496377697 + ... + 10496377704.

It is an arithmetic number, because the mean of its divisors is an integer number (24491547969).

Almost surely, 2^83971021604 is an apocalyptic number.

It is an amenable number.

83971021604 is a deficient number, since it is larger than the sum of its proper divisors (62978266210).

83971021604 is a wasteful number, since it uses less digits than its factorization.

83971021604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20992755405 (or 20992755403 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 83971021604 in words is "eighty-three billion, nine hundred seventy-one million, twenty-one thousand, six hundred four".