64808292493 has 4 divisors (see below), whose sum is σ = 74066620000. Its totient is φ = 55549964988.

The previous prime is 64808292473. The next prime is 64808292509. The reversal of 64808292493 is 39429280846.

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 de Polignac number, because none of the positive numbers 2^k-64808292493 is a prime.

It is a super-2 number, since 2×64808292493² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64808292443) 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, 4629163743 + ... + 4629163756.

It is an arithmetic number, because the mean of its divisors is an integer number (18516655000).

Almost surely, 2^64808292493 is an apocalyptic number.

It is an amenable number.

64808292493 is a deficient number, since it is larger than the sum of its proper divisors (9258327507).

64808292493 is an equidigital number, since it uses as much as digits as its factorization.

64808292493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9258327506.

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 64808292493 in words is "sixty-four billion, eight hundred eight million, two hundred ninety-two thousand, four hundred ninety-three".