64977901 has 2 divisors, whose sum is σ = 64977902. Its totient is φ = 64977900.

The previous prime is 64977881. The next prime is 64977917. The reversal of 64977901 is 10977946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62252100 + 2725801 = 7890^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 64977901 - 2⁹ = 64977389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64977931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32488950 + 32488951.

It is an arithmetic number, because the mean of its divisors is an integer number (32488951).

Almost surely, 2^64977901 is an apocalyptic number.

It is an amenable number.

64977901 is a deficient number, since it is larger than the sum of its proper divisors (1).

64977901 is an equidigital number, since it uses as much as digits as its factorization.

64977901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 64977901 is about 8060.8871099898. The cubic root of 64977901 is about 402.0270045306.

The spelling of 64977901 in words is "sixty-four million, nine hundred seventy-seven thousand, nine hundred one".