8357721551 has 4 divisors (see below), whose sum is σ = 8627325504. Its totient is φ = 8088117600.

The previous prime is 8357721511. The next prime is 8357721583. The reversal of 8357721551 is 1551277538.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551277538 = 2 ⋅775638769.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8357721551 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 (8357721511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134801930 + ... + 134801991.

It is an arithmetic number, because the mean of its divisors is an integer number (2156831376).

Almost surely, 2^8357721551 is an apocalyptic number.

8357721551 is a deficient number, since it is larger than the sum of its proper divisors (269603953).

8357721551 is a wasteful number, since it uses less digits than its factorization.

8357721551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269603952.

The product of its digits is 294000, while the sum is 44.

The square root of 8357721551 is about 91420.5750966378. The cubic root of 8357721551 is about 2029.3765264823.

The spelling of 8357721551 in words is "eight billion, three hundred fifty-seven million, seven hundred twenty-one thousand, five hundred fifty-one".