83815637551 has 4 divisors (see below), whose sum is σ = 83818243600. Its totient is φ = 83813031504.

The previous prime is 83815637491. The next prime is 83815637573. The reversal of 83815637551 is 15573651838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15573651838 = 2 ⋅7786825919.

It is a cyclic number.

It is not a de Polignac number, because 83815637551 - 2⁹ = 83815637039 is a prime.

It is a super-2 number, since 2×83815637551² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83815637951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254171 + ... + 1319308.

It is an arithmetic number, because the mean of its divisors is an integer number (20954560900).

Almost surely, 2^83815637551 is an apocalyptic number.

83815637551 is a deficient number, since it is larger than the sum of its proper divisors (2606049).

83815637551 is a wasteful number, since it uses less digits than its factorization.

83815637551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606048.

The product of its digits is 3024000, while the sum is 52.

The spelling of 83815637551 in words is "eighty-three billion, eight hundred fifteen million, six hundred thirty-seven thousand, five hundred fifty-one".