15505156491 has 16 divisors (see below), whose sum is σ = 22559242368. Its totient is φ = 9394444800.

The previous prime is 15505156487. The next prime is 15505156507. The reversal of 15505156491 is 19465150551.

It is a happy number.

It is not a de Polignac number, because 15505156491 - 2² = 15505156487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15505156411) 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 15 ways as a sum of consecutive naturals, for example, 58155 + ... + 185451.

It is an arithmetic number, because the mean of its divisors is an integer number (1409952648).

Almost surely, 2^15505156491 is an apocalyptic number.

15505156491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15505156491 is a deficient number, since it is larger than the sum of its proper divisors (7054085877).

15505156491 is a wasteful number, since it uses less digits than its factorization.

15505156491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131002.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 15505156491 in words is "fifteen billion, five hundred five million, one hundred fifty-six thousand, four hundred ninety-one".