66867653953 has 16 divisors (see below), whose sum is σ = 73015240320. Its totient is φ = 60996140800.

The previous prime is 66867653899. The next prime is 66867653977. The reversal of 66867653953 is 35935676866.

It is a cyclic number.

It is not a de Polignac number, because 66867653953 - 2²⁹ = 66330783041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66867653053) 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, 398278 + ... + 540703.

It is an arithmetic number, because the mean of its divisors is an integer number (4563452520).

Almost surely, 2^66867653953 is an apocalyptic number.

It is an amenable number.

66867653953 is a deficient number, since it is larger than the sum of its proper divisors (6147586367).

66867653953 is a wasteful number, since it uses less digits than its factorization.

66867653953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939128.

The product of its digits is 146966400, while the sum is 64.

The spelling of 66867653953 in words is "sixty-six billion, eight hundred sixty-seven million, six hundred fifty-three thousand, nine hundred fifty-three".