66372551 has 8 divisors (see below), whose sum is σ = 76707360. Its totient is φ = 56251008.

The previous prime is 66372547. The next prime is 66372557. The reversal of 66372551 is 15527366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66372551 - 2² = 66372547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66372557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52646 + ... + 53891.

It is an arithmetic number, because the mean of its divisors is an integer number (9588420).

Almost surely, 2^66372551 is an apocalyptic number.

66372551 is a deficient number, since it is larger than the sum of its proper divisors (10334809).

66372551 is a wasteful number, since it uses less digits than its factorization.

66372551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106633.

The product of its digits is 37800, while the sum is 35.

The square root of 66372551 is about 8146.9350678645. The cubic root of 66372551 is about 404.8829636928.

The spelling of 66372551 in words is "sixty-six million, three hundred seventy-two thousand, five hundred fifty-one".