15516461551 has 4 divisors (see below), whose sum is σ = 15516894600. Its totient is φ = 15516028504.

The previous prime is 15516461533. The next prime is 15516461563.

It is a happy number.

15516461551 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 a de Polignac number, because none of the positive numbers 2^k-15516461551 is a prime.

It is a super-2 number, since 2×15516461551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15516461591) 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, 157396 + ... + 236233.

It is an arithmetic number, because the mean of its divisors is an integer number (3879223650).

Almost surely, 2^15516461551 is an apocalyptic number.

15516461551 is a deficient number, since it is larger than the sum of its proper divisors (433049).

15516461551 is an equidigital number, since it uses as much as digits as its factorization.

15516461551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433048.

The product of its digits is 90000, while the sum is 40.

The spelling of 15516461551 in words is "fifteen billion, five hundred sixteen million, four hundred sixty-one thousand, five hundred fifty-one".