66100056060551 has 16 divisors (see below), whose sum is σ = 70357305231360. Its totient is φ = 62004701609760.

The previous prime is 66100056060517. The next prime is 66100056060559. The reversal of 66100056060551 is 15506065000166.

It is a cyclic number.

It is not a de Polignac number, because 66100056060551 - 2¹⁸ = 66100055798407 is a prime.

It is a super-2 number, since 2×66100056060551² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66100056060499 and 66100056060508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66100056060559) 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, 242220971 + ... + 242493708.

It is an arithmetic number, because the mean of its divisors is an integer number (4397331576960).

Almost surely, 2^{66100056060551} is an apocalyptic number.

66100056060551 is a deficient number, since it is larger than the sum of its proper divisors (4257249170809).

66100056060551 is a wasteful number, since it uses less digits than its factorization.

66100056060551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484714846.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 66100056060551 in words is "sixty-six trillion, one hundred billion, fifty-six million, sixty thousand, five hundred fifty-one".