83921561437 has 8 divisors (see below), whose sum is σ = 95948420672. Its totient is φ = 71904218400.

The previous prime is 83921561431. The next prime is 83921561441. The reversal of 83921561437 is 73416512938.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-83921561437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83921561431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360139 + ... + 2395432.

It is an arithmetic number, because the mean of its divisors is an integer number (11993552584).

Almost surely, 2^83921561437 is an apocalyptic number.

It is an amenable number.

83921561437 is a deficient number, since it is larger than the sum of its proper divisors (12026859235).

83921561437 is a wasteful number, since it uses less digits than its factorization.

83921561437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758099.

The product of its digits is 1088640, while the sum is 49.

The spelling of 83921561437 in words is "eighty-three billion, nine hundred twenty-one million, five hundred sixty-one thousand, four hundred thirty-seven".