66637890407 has 6 divisors (see below), whose sum is σ = 73246606944. Its totient is φ = 60579900260.

The previous prime is 66637890379. The next prime is 66637890463. The reversal of 66637890407 is 70409873666.

It is a happy number.

It is not a de Polignac number, because 66637890407 - 2¹² = 66637886311 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 (66637890707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275363063 + ... + 275363304.

It is an arithmetic number, because the mean of its divisors is an integer number (12207767824).

Almost surely, 2^66637890407 is an apocalyptic number.

66637890407 is a deficient number, since it is larger than the sum of its proper divisors (6608716537).

66637890407 is a wasteful number, since it uses less digits than its factorization.

66637890407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550726389 (or 550726378 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 66637890407 in words is "sixty-six billion, six hundred thirty-seven million, eight hundred ninety thousand, four hundred seven".