15551050665505 has 16 divisors (see below), whose sum is σ = 19062483264000. Its totient is φ = 12173474843712.

The previous prime is 15551050665503. The next prime is 15551050665517. The reversal of 15551050665505 is 50556605015551.

It is a cyclic number.

It is not a de Polignac number, because 15551050665505 - 2¹ = 15551050665503 is a prime.

It is a super-2 number, since 2×15551050665505² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15551050665503) 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, 6171630 + ... + 8318119.

It is an arithmetic number, because the mean of its divisors is an integer number (1191405204000).

Almost surely, 2^{15551050665505} is an apocalyptic number.

It is an amenable number.

15551050665505 is a deficient number, since it is larger than the sum of its proper divisors (3511432598495).

15551050665505 is a wasteful number, since it uses less digits than its factorization.

15551050665505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14494368.

The product of its (nonzero) digits is 2812500, while the sum is 49.

The spelling of 15551050665505 in words is "fifteen trillion, five hundred fifty-one billion, fifty million, six hundred sixty-five thousand, five hundred five".