66361877 has 4 divisors (see below), whose sum is σ = 69247200. Its totient is φ = 63476556.

The previous prime is 66361873. The next prime is 66361907. The reversal of 66361877 is 77816366.

It is a happy number.

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: 77816366 = 2 ⋅38908183.

It is a cyclic number.

It is not a de Polignac number, because 66361877 - 2² = 66361873 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 (66361873) 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, 1442627 + ... + 1442672.

It is an arithmetic number, because the mean of its divisors is an integer number (17311800).

Almost surely, 2^66361877 is an apocalyptic number.

It is an amenable number.

66361877 is a deficient number, since it is larger than the sum of its proper divisors (2885323).

66361877 is a wasteful number, since it uses less digits than its factorization.

66361877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885322.

The product of its digits is 254016, while the sum is 44.

The square root of 66361877 is about 8146.2799485409. The cubic root of 66361877 is about 404.8612581716.

The spelling of 66361877 in words is "sixty-six million, three hundred sixty-one thousand, eight hundred seventy-seven".