64158761 has 2 divisors, whose sum is σ = 64158762. Its totient is φ = 64158760.

The previous prime is 64158737. The next prime is 64158767. The reversal of 64158761 is 16785146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63696361 + 462400 = 7981^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 64158761 - 2¹⁸ = 63896617 is a prime.

It is a super-2 number, since 2×64158761² = 8232693226110242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64158767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32079380 + 32079381.

It is an arithmetic number, because the mean of its divisors is an integer number (32079381).

Almost surely, 2^64158761 is an apocalyptic number.

It is an amenable number.

64158761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64158761 is an equidigital number, since it uses as much as digits as its factorization.

64158761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 64158761 is about 8009.9164165427. The cubic root of 64158761 is about 400.3304789673.

The spelling of 64158761 in words is "sixty-four million, one hundred fifty-eight thousand, seven hundred sixty-one".