64953997 has 4 divisors (see below), whose sum is σ = 67193820. Its totient is φ = 62714176.

The previous prime is 64953971. The next prime is 64954003. The reversal of 64953997 is 79935946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79935946 = 2 ⋅39967973.

It can be written as a sum of positive squares in 2 ways, for example, as 27573001 + 37380996 = 5251^2 + 6114^2 .

It is a cyclic number.

It is not a de Polignac number, because 64953997 - 2¹⁹ = 64429709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64953947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1119868 + ... + 1119925.

It is an arithmetic number, because the mean of its divisors is an integer number (16798455).

Almost surely, 2^64953997 is an apocalyptic number.

It is an amenable number.

64953997 is a deficient number, since it is larger than the sum of its proper divisors (2239823).

64953997 is a wasteful number, since it uses less digits than its factorization.

64953997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239822.

The product of its digits is 1837080, while the sum is 52.

The square root of 64953997 is about 8059.4042583804. The cubic root of 64953997 is about 401.9776993974.

It can be divided in two parts, 649539 and 97, that added together give a square (649636 = 806²).

The spelling of 64953997 in words is "sixty-four million, nine hundred fifty-three thousand, nine hundred ninety-seven".