15515051155550 has 24 divisors (see below), whose sum is σ = 28858450076400. Its totient is φ = 6205922628480.

The previous prime is 15515051155543. The next prime is 15515051155567. The reversal of 15515051155550 is 5555115051551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800246 + ... + 5627654.

It is an arithmetic number, because the mean of its divisors is an integer number (1202435419850).

Almost surely, 2^{15515051155550} is an apocalyptic number.

15515051155550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15515051155550 is a deficient number, since it is larger than the sum of its proper divisors (13343398920850).

15515051155550 is a wasteful number, since it uses less digits than its factorization.

15515051155550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891700 (or 4891695 counting only the distinct ones).

The product of its (nonzero) digits is 390625, while the sum is 44.

The spelling of 15515051155550 in words is "fifteen trillion, five hundred fifteen billion, fifty-one million, one hundred fifty-five thousand, five hundred fifty".