7899505551 has 36 divisors (see below), whose sum is σ = 13490960184. Its totient is φ = 4439988000.

The previous prime is 7899505507. The next prime is 7899505553. The reversal of 7899505551 is 1555059987.

It is a happy number.

7899505551 is a `hidden beast` number, since 7 + 89 + 9 + 5 + 0 + 5 + 551 = 666.

7899505551 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7899505551 - 2⁶ = 7899505487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7899505553) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 119925 + ... + 173726.

It is an arithmetic number, because the mean of its divisors is an integer number (374748894).

Almost surely, 2^7899505551 is an apocalyptic number.

7899505551 is a deficient number, since it is larger than the sum of its proper divisors (5591454633).

7899505551 is a wasteful number, since it uses less digits than its factorization.

7899505551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293732 (or 293722 counting only the distinct ones).

The product of its (nonzero) digits is 2835000, while the sum is 54.

The square root of 7899505551 is about 88879.1626366945. The cubic root of 7899505551 is about 1991.5901493554.

The spelling of 7899505551 in words is "seven billion, eight hundred ninety-nine million, five hundred five thousand, five hundred fifty-one".