66525977 has 6 divisors (see below), whose sum is σ = 77387418. Its totient is φ = 57022224.

The previous prime is 66525961. The next prime is 66525983. The reversal of 66525977 is 77952566.

It can be written as a sum of positive squares in only one way, i.e., 62900761 + 3625216 = 7931^2 + 1904^2 .

It is not a de Polignac number, because 66525977 - 2⁴ = 66525961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66525577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 678788 + ... + 678885.

It is an arithmetic number, because the mean of its divisors is an integer number (12897903).

Almost surely, 2^66525977 is an apocalyptic number.

It is an amenable number.

66525977 is a deficient number, since it is larger than the sum of its proper divisors (10861441).

66525977 is a wasteful number, since it uses less digits than its factorization.

66525977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357687 (or 1357680 counting only the distinct ones).

The product of its digits is 793800, while the sum is 47.

The square root of 66525977 is about 8156.3458116978. The cubic root of 66525977 is about 405.1946978313.

The spelling of 66525977 in words is "sixty-six million, five hundred twenty-five thousand, nine hundred seventy-seven".