64812557 has 2 divisors, whose sum is σ = 64812558. Its totient is φ = 64812556.

The previous prime is 64812541. The next prime is 64812569. The reversal of 64812557 is 75521846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32878756 + 31933801 = 5734^2 + 5651^2 .

It is a cyclic number.

It is not a de Polignac number, because 64812557 - 2⁴ = 64812541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64812557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64812157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32406278 + 32406279.

It is an arithmetic number, because the mean of its divisors is an integer number (32406279).

Almost surely, 2^64812557 is an apocalyptic number.

It is an amenable number.

64812557 is a deficient number, since it is larger than the sum of its proper divisors (1).

64812557 is an equidigital number, since it uses as much as digits as its factorization.

64812557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 64812557 is about 8050.6246341511. The cubic root of 64812557 is about 401.6857130327.

The spelling of 64812557 in words is "sixty-four million, eight hundred twelve thousand, five hundred fifty-seven".