15515015505166 has 4 divisors (see below), whose sum is σ = 23272523257752. Its totient is φ = 7757507752582.

The previous prime is 15515015505109. The next prime is 15515015505173. The reversal of 15515015505166 is 66150551051551.

It is a happy number.

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

It is a super-2 number, since 2×15515015505166² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3878753876290 + ... + 3878753876293.

It is an arithmetic number, because the mean of its divisors is an integer number (5818130814438).

Almost surely, 2^{15515015505166} is an apocalyptic number.

15515015505166 is a deficient number, since it is larger than the sum of its proper divisors (7757507752586).

15515015505166 is an equidigital number, since it uses as much as digits as its factorization.

15515015505166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7757507752585.

The product of its (nonzero) digits is 562500, while the sum is 46.

The spelling of 15515015505166 in words is "fifteen trillion, five hundred fifteen billion, fifteen million, five hundred five thousand, one hundred sixty-six".