669761377 has 4 divisors (see below), whose sum is σ = 671227396. Its totient is φ = 668295360.

The previous prime is 669761329. The next prime is 669761399. The reversal of 669761377 is 773167966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291692241 + 378069136 = 17079^2 + 19444^2 .

It is a cyclic number.

It is not a de Polignac number, because 669761377 - 2²³ = 661372769 is a prime.

It is a super-2 number, since 2×669761377² = 897160604241872258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669161377) 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, 732324 + ... + 733237.

It is an arithmetic number, because the mean of its divisors is an integer number (167806849).

Almost surely, 2^669761377 is an apocalyptic number.

It is an amenable number.

669761377 is a deficient number, since it is larger than the sum of its proper divisors (1466019).

669761377 is a wasteful number, since it uses less digits than its factorization.

669761377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466018.

The product of its digits is 2000376, while the sum is 52.

The square root of 669761377 is about 25879.7483952221. The cubic root of 669761377 is about 874.9301177387.

The spelling of 669761377 in words is "six hundred sixty-nine million, seven hundred sixty-one thousand, three hundred seventy-seven".