64195997 has 2 divisors, whose sum is σ = 64195998. Its totient is φ = 64195996.

The previous prime is 64195993. The next prime is 64196051. The reversal of 64195997 is 79959146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59151481 + 5044516 = 7691^2 + 2246^2 .

It is a cyclic number.

It is not a de Polignac number, because 64195997 - 2² = 64195993 is a prime.

It is a super-2 number, since 2×64195997² = 8242252061648018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64195991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32097998 + 32097999.

It is an arithmetic number, because the mean of its divisors is an integer number (32097999).

Almost surely, 2^64195997 is an apocalyptic number.

It is an amenable number.

64195997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64195997 is an equidigital number, since it uses as much as digits as its factorization.

64195997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 50.

The square root of 64195997 is about 8012.2404482142. The cubic root of 64195997 is about 400.4079109635.

The spelling of 64195997 in words is "sixty-four million, one hundred ninety-five thousand, nine hundred ninety-seven".