66870757 has 4 divisors (see below), whose sum is σ = 67868896. Its totient is φ = 65872620.

The previous prime is 66870731. The next prime is 66870761. The reversal of 66870757 is 75707866.

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.

It is a cyclic number.

It is not a de Polignac number, because 66870757 - 2¹⁵ = 66837989 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 (66874757) 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, 498969 + ... + 499102.

It is an arithmetic number, because the mean of its divisors is an integer number (16967224).

Almost surely, 2^66870757 is an apocalyptic number.

66870757 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66870757 is a deficient number, since it is larger than the sum of its proper divisors (998139).

66870757 is an equidigital number, since it uses as much as digits as its factorization.

66870757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998138.

The product of its (nonzero) digits is 493920, while the sum is 46.

The square root of 66870757 is about 8177.4541881933. The cubic root of 66870757 is about 405.8934843972.

The spelling of 66870757 in words is "sixty-six million, eight hundred seventy thousand, seven hundred fifty-seven".