15553665655545 has 32 divisors (see below), whose sum is σ = 25186458471552. Its totient is φ = 8195096604672.

The previous prime is 15553665655537. The next prime is 15553665655613. The reversal of 15553665655545 is 54555656635551.

It is not a de Polignac number, because 15553665655545 - 2³ = 15553665655537 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45262617 + ... + 45604953.

It is an arithmetic number, because the mean of its divisors is an integer number (787076827236).

Almost surely, 2^{15553665655545} is an apocalyptic number.

15553665655545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15553665655545 is a deficient number, since it is larger than the sum of its proper divisors (9632792816007).

15553665655545 is a wasteful number, since it uses less digits than its factorization.

15553665655545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378921.

The product of its digits is 1012500000, while the sum is 66.

The spelling of 15553665655545 in words is "fifteen trillion, five hundred fifty-three billion, six hundred sixty-five million, six hundred fifty-five thousand, five hundred forty-five".