56664210397 has 4 divisors (see below), whose sum is σ = 59646537280. Its totient is φ = 53681883516.

The previous prime is 56664210389. The next prime is 56664210403. The reversal of 56664210397 is 79301246665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56664210397 - 2³ = 56664210389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56664210397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56664210367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1491163413 + ... + 1491163450.

It is an arithmetic number, because the mean of its divisors is an integer number (14911634320).

Almost surely, 2^56664210397 is an apocalyptic number.

It is an amenable number.

56664210397 is a deficient number, since it is larger than the sum of its proper divisors (2982326883).

56664210397 is a wasteful number, since it uses less digits than its factorization.

56664210397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982326882.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 56664210397 in words is "fifty-six billion, six hundred sixty-four million, two hundred ten thousand, three hundred ninety-seven".