66279157 has 4 divisors (see below), whose sum is σ = 75747616. Its totient is φ = 56810700.

The previous prime is 66279149. The next prime is 66279197. The reversal of 66279157 is 75197266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75197266 = 2 ⋅37598633.

It is a cyclic number.

It is not a de Polignac number, because 66279157 - 2³ = 66279149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66279137) 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, 4734219 + ... + 4734232.

It is an arithmetic number, because the mean of its divisors is an integer number (18936904).

Almost surely, 2^66279157 is an apocalyptic number.

It is an amenable number.

66279157 is a deficient number, since it is larger than the sum of its proper divisors (9468459).

66279157 is an equidigital number, since it uses as much as digits as its factorization.

66279157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9468458.

The product of its digits is 158760, while the sum is 43.

The square root of 66279157 is about 8141.2012012970. The cubic root of 66279157 is about 404.6929685372.

The spelling of 66279157 in words is "sixty-six million, two hundred seventy-nine thousand, one hundred fifty-seven".