66892074987 has 6 divisors (see below), whose sum is σ = 89190030612. Its totient is φ = 44594418012.

The previous prime is 66892074967. The next prime is 66892075027. The reversal of 66892074987 is 78947029866.

It is not a de Polignac number, because 66892074987 - 2⁶ = 66892074923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66892074967) 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, 373308 + ... + 522630.

It is an arithmetic number, because the mean of its divisors is an integer number (14865005102).

Almost surely, 2^66892074987 is an apocalyptic number.

66892074987 is a deficient number, since it is larger than the sum of its proper divisors (22297955625).

66892074987 is an frugal number, since it uses more digits than its factorization.

66892074987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298649 (or 149326 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 66.

The spelling of 66892074987 in words is "sixty-six billion, eight hundred ninety-two million, seventy-four thousand, nine hundred eighty-seven".