83415990991 has 8 divisors (see below), whose sum is σ = 89395281504. Its totient is φ = 77632742880.

The previous prime is 83415990979. The next prime is 83415991003. The reversal of 83415990991 is 19909951438.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (83415990979) and next prime (83415991003).

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

It is not a de Polignac number, because 83415990991 - 2¹³ = 83415982799 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 (83415990941) 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, 49009720 + ... + 49011421.

It is an arithmetic number, because the mean of its divisors is an integer number (11174410188).

Almost surely, 2^83415990991 is an apocalyptic number.

83415990991 is a deficient number, since it is larger than the sum of its proper divisors (5979290513).

83415990991 is a wasteful number, since it uses less digits than its factorization.

83415990991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98021201.

The product of its (nonzero) digits is 3149280, while the sum is 58.

The spelling of 83415990991 in words is "eighty-three billion, four hundred fifteen million, nine hundred ninety thousand, nine hundred ninety-one".