64451297518 has 4 divisors (see below), whose sum is σ = 96676946280. Its totient is φ = 32225648758.

The previous prime is 64451297489. The next prime is 64451297543. The reversal of 64451297518 is 81579215446.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16112824378 + ... + 16112824381.

It is an arithmetic number, because the mean of its divisors is an integer number (24169236570).

Almost surely, 2^64451297518 is an apocalyptic number.

64451297518 is a deficient number, since it is larger than the sum of its proper divisors (32225648762).

64451297518 is a wasteful number, since it uses less digits than its factorization.

64451297518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32225648761.

The product of its digits is 2419200, while the sum is 52.

The spelling of 64451297518 in words is "sixty-four billion, four hundred fifty-one million, two hundred ninety-seven thousand, five hundred eighteen".