155665566615 has 16 divisors (see below), whose sum is σ = 268223745888. Its totient is φ = 76635355776.

The previous prime is 155665566613. The next prime is 155665566779. The reversal of 155665566615 is 516665566551.

It is not a de Polignac number, because 155665566615 - 2¹ = 155665566613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155665566613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399142284 + ... + 399142673.

It is an arithmetic number, because the mean of its divisors is an integer number (16763984118).

Almost surely, 2^155665566615 is an apocalyptic number.

155665566615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155665566615 is a deficient number, since it is larger than the sum of its proper divisors (112558179273).

155665566615 is a wasteful number, since it uses less digits than its factorization.

155665566615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798284978.

The product of its digits is 24300000, while the sum is 57.

The spelling of 155665566615 in words is "one hundred fifty-five billion, six hundred sixty-five million, five hundred sixty-six thousand, six hundred fifteen".