664542601451 has 16 divisors (see below), whose sum is σ = 699199300800. Its totient is φ = 630759618048.

The previous prime is 664542601447. The next prime is 664542601493. The reversal of 664542601451 is 154106245466.

It is a cyclic number.

It is not a de Polignac number, because 664542601451 - 2² = 664542601447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664542601421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402746 + ... + 1221183.

It is an arithmetic number, because the mean of its divisors is an integer number (43699956300).

Almost surely, 2^664542601451 is an apocalyptic number.

664542601451 is a deficient number, since it is larger than the sum of its proper divisors (34656699349).

664542601451 is a wasteful number, since it uses less digits than its factorization.

664542601451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624198.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 664542601451 in words is "six hundred sixty-four billion, five hundred forty-two million, six hundred one thousand, four hundred fifty-one".