66620157407 has 4 divisors (see below), whose sum is σ = 66621672000. Its totient is φ = 66618642816.

The previous prime is 66620157389. The next prime is 66620157451. The reversal of 66620157407 is 70475102666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66620157407 - 2⁶ = 66620157343 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 (66620157707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689282 + ... + 779967.

It is an arithmetic number, because the mean of its divisors is an integer number (16655418000).

Almost surely, 2^66620157407 is an apocalyptic number.

66620157407 is a deficient number, since it is larger than the sum of its proper divisors (1514593).

66620157407 is a wasteful number, since it uses less digits than its factorization.

66620157407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514592.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 66620157407 in words is "sixty-six billion, six hundred twenty million, one hundred fifty-seven thousand, four hundred seven".