2566829978 has 4 divisors (see below), whose sum is σ = 3850244970. Its totient is φ = 1283414988.

The previous prime is 2566829959. The next prime is 2566830053. The reversal of 2566829978 is 8799286652.

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

It can be written as a sum of positive squares in only one way, i.e., 1562383729 + 1004446249 = 39527^2 + 31693^2 .

It is a super-2 number, since 2×2566829978² = 13177232271918960968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2566829978.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641707493 + ... + 641707496.

Almost surely, 2^2566829978 is an apocalyptic number.

2566829978 is a deficient number, since it is larger than the sum of its proper divisors (1283414992).

2566829978 is a wasteful number, since it uses less digits than its factorization.

2566829978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283414991.

The product of its digits is 26127360, while the sum is 62.

The square root of 2566829978 is about 50663.8922507934. The cubic root of 2566829978 is about 1369.1962497380.

The spelling of 2566829978 in words is "two billion, five hundred sixty-six million, eight hundred twenty-nine thousand, nine hundred seventy-eight".