66980551 has 8 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 60819000.

The previous prime is 66980521. The next prime is 66980569. The reversal of 66980551 is 15508966.

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

It is not a de Polignac number, because 66980551 - 2⁷ = 66980423 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 (66980521) 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, 7546 + ... + 13816.

It is an arithmetic number, because the mean of its divisors is an integer number (9144576).

Almost surely, 2^66980551 is an apocalyptic number.

66980551 is a deficient number, since it is larger than the sum of its proper divisors (6176057).

66980551 is a wasteful number, since it uses less digits than its factorization.

66980551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7253.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 66980551 is about 8184.1646488814. The cubic root of 66980551 is about 406.1155062169.

The spelling of 66980551 in words is "sixty-six million, nine hundred eighty thousand, five hundred fifty-one".