15509290551 has 4 divisors (see below), whose sum is σ = 20679054072. Its totient is φ = 10339527032.

The previous prime is 15509290547. The next prime is 15509290591.

15509290551 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 15509290551 - 2² = 15509290547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15509290541) 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, 2584881756 + ... + 2584881761.

It is an arithmetic number, because the mean of its divisors is an integer number (5169763518).

Almost surely, 2^15509290551 is an apocalyptic number.

15509290551 is a deficient number, since it is larger than the sum of its proper divisors (5169763521).

15509290551 is an equidigital number, since it uses as much as digits as its factorization.

15509290551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5169763520.

The product of its (nonzero) digits is 101250, while the sum is 42.

The spelling of 15509290551 in words is "fifteen billion, five hundred nine million, two hundred ninety thousand, five hundred fifty-one".