66625000721091 has 12 divisors (see below), whose sum is σ = 96236184259800. Its totient is φ = 44416633867200.

The previous prime is 66625000720981. The next prime is 66625000721093. The reversal of 66625000721091 is 19012700052666.

It is not a de Polignac number, because 66625000721091 - 2¹⁴ = 66625000704707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66625000721093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18469116 + ... + 21779766.

It is an arithmetic number, because the mean of its divisors is an integer number (8019682021650).

Almost surely, 2^{66625000721091} is an apocalyptic number.

66625000721091 is a deficient number, since it is larger than the sum of its proper divisors (29611183538709).

66625000721091 is a wasteful number, since it uses less digits than its factorization.

66625000721091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546706 (or 5546703 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 66625000721091 in words is "sixty-six trillion, six hundred twenty-five billion, seven hundred twenty-one thousand, ninety-one".