64555951 has 2 divisors, whose sum is σ = 64555952. Its totient is φ = 64555950.

The previous prime is 64555913. The next prime is 64556033. The reversal of 64555951 is 15955546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64555951 - 2²³ = 56167343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64505951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32277975 + 32277976.

It is an arithmetic number, because the mean of its divisors is an integer number (32277976).

Almost surely, 2^64555951 is an apocalyptic number.

64555951 is a deficient number, since it is larger than the sum of its proper divisors (1).

64555951 is an equidigital number, since it uses as much as digits as its factorization.

64555951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135000, while the sum is 40.

The square root of 64555951 is about 8034.6718041249. The cubic root of 64555951 is about 401.1548935929.

The spelling of 64555951 in words is "sixty-four million, five hundred fifty-five thousand, nine hundred fifty-one".