64908551 has 4 divisors (see below), whose sum is σ = 66289632. Its totient is φ = 63527472.

The previous prime is 64908527. The next prime is 64908577. The reversal of 64908551 is 15580946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64908551 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 (64908511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690470 + ... + 690563.

It is an arithmetic number, because the mean of its divisors is an integer number (16572408).

Almost surely, 2^64908551 is an apocalyptic number.

64908551 is a deficient number, since it is larger than the sum of its proper divisors (1381081).

64908551 is a wasteful number, since it uses less digits than its factorization.

64908551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381080.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 64908551 is about 8056.5843258791. The cubic root of 64908551 is about 401.8839276944.

The spelling of 64908551 in words is "sixty-four million, nine hundred eight thousand, five hundred fifty-one".