8154216551 has 4 divisors (see below), whose sum is σ = 8781463992. Its totient is φ = 7526969112.

The previous prime is 8154216527. The next prime is 8154216563. The reversal of 8154216551 is 1556124518.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-8154216551 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 (8154216451) 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, 313623701 + ... + 313623726.

It is an arithmetic number, because the mean of its divisors is an integer number (2195365998).

Almost surely, 2^8154216551 is an apocalyptic number.

8154216551 is a deficient number, since it is larger than the sum of its proper divisors (627247441).

8154216551 is a wasteful number, since it uses less digits than its factorization.

8154216551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627247440.

The product of its digits is 48000, while the sum is 38.

The square root of 8154216551 is about 90300.7007226411. The cubic root of 8154216551 is about 2012.7696734466.

The spelling of 8154216551 in words is "eight billion, one hundred fifty-four million, two hundred sixteen thousand, five hundred fifty-one".