83970624538 has 4 divisors (see below), whose sum is σ = 125955936810. Its totient is φ = 41985312268.

The previous prime is 83970624527. The next prime is 83970624547. The reversal of 83970624538 is 83542607938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83542607938 = 2 ⋅41771303969.

It can be written as a sum of positive squares in only one way, i.e., 81397801809 + 2572822729 = 285303^2 + 50723^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20992656133 + ... + 20992656136.

Almost surely, 2^83970624538 is an apocalyptic number.

83970624538 is a deficient number, since it is larger than the sum of its proper divisors (41985312272).

83970624538 is a wasteful number, since it uses less digits than its factorization.

83970624538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41985312271.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 83970624538 in words is "eighty-three billion, nine hundred seventy million, six hundred twenty-four thousand, five hundred thirty-eight".