66501957577 has 8 divisors (see below), whose sum is σ = 73630390752. Its totient is φ = 59553991200.

The previous prime is 66501957559. The next prime is 66501957607. The reversal of 66501957577 is 77575910566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-66501957577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66501957517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45115924 + ... + 45117397.

It is an arithmetic number, because the mean of its divisors is an integer number (9203798844).

Almost surely, 2^66501957577 is an apocalyptic number.

66501957577 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66501957577 is a deficient number, since it is larger than the sum of its proper divisors (7128433175).

66501957577 is a wasteful number, since it uses less digits than its factorization.

66501957577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90233399.

The product of its (nonzero) digits is 13891500, while the sum is 58.

The spelling of 66501957577 in words is "sixty-six billion, five hundred one million, nine hundred fifty-seven thousand, five hundred seventy-seven".