255400666 has 4 divisors (see below), whose sum is σ = 383101002. Its totient is φ = 127700332.

The previous prime is 255400633. The next prime is 255400699. The reversal of 255400666 is 666004552.

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

It is an interprime number because it is at equal distance from previous prime (255400633) and next prime (255400699).

It can be written as a sum of positive squares in only one way, i.e., 252142641 + 3258025 = 15879^2 + 1805^2 .

It is a super-4 number, since 4×255400666⁴ (a number of 35 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63850165 + ... + 63850168.

Almost surely, 2^255400666 is an apocalyptic number.

255400666 is a deficient number, since it is larger than the sum of its proper divisors (127700336).

255400666 is a wasteful number, since it uses less digits than its factorization.

255400666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127700335.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 255400666 is about 15981.2598376974. The cubic root of 255400666 is about 634.4645213953.

The spelling of 255400666 in words is "two hundred fifty-five million, four hundred thousand, six hundred sixty-six".