15505550655 has 64 divisors (see below), whose sum is σ = 30513189888. Its totient is φ = 6561884160.

The previous prime is 15505550639. The next prime is 15505550699. The reversal of 15505550655 is 55605550551.

It is not a de Polignac number, because 15505550655 - 2⁴ = 15505550639 is a prime.

It is a super-2 number, since 2×15505550655² (a number of 21 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 in 63 ways as a sum of consecutive naturals, for example, 37684 + ... + 180086.

It is an arithmetic number, because the mean of its divisors is an integer number (476768592).

Almost surely, 2^15505550655 is an apocalyptic number.

15505550655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15505550655 is a deficient number, since it is larger than the sum of its proper divisors (15007639233).

15505550655 is a wasteful number, since it uses less digits than its factorization.

15505550655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142496.

The product of its (nonzero) digits is 468750, while the sum is 42.

The spelling of 15505550655 in words is "fifteen billion, five hundred five million, five hundred fifty thousand, six hundred fifty-five".