66100002550 has 24 divisors (see below), whose sum is σ = 122957411472. Its totient is φ = 26437548000.

The previous prime is 66100002533. The next prime is 66100002569. The reversal of 66100002550 is 5520000166.

It is a super-2 number, since 2×66100002550² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 541695 + ... + 652405.

It is an arithmetic number, because the mean of its divisors is an integer number (5123225478).

Almost surely, 2^66100002550 is an apocalyptic number.

66100002550 is a deficient number, since it is larger than the sum of its proper divisors (56857408922).

66100002550 is a wasteful number, since it uses less digits than its factorization.

66100002550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122664 (or 122659 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 66100002550 in words is "sixty-six billion, one hundred million, two thousand, five hundred fifty".