66990250 has 16 divisors (see below), whose sum is σ = 125406216. Its totient is φ = 26796000.

The previous prime is 66990223. The next prime is 66990263. The reversal of 66990250 is 5209966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13860729 + 53129521 = 3723^2 + 7289^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133731 + ... + 134230.

Almost surely, 2^66990250 is an apocalyptic number.

66990250 is a deficient number, since it is larger than the sum of its proper divisors (58415966).

66990250 is a wasteful number, since it uses less digits than its factorization.

66990250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267978 (or 267968 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 66990250 is about 8184.7571741622. The cubic root of 66990250 is about 406.1351075495.

The spelling of 66990250 in words is "sixty-six million, nine hundred ninety thousand, two hundred fifty".