2566790391 has 16 divisors (see below), whose sum is σ = 3794721408. Its totient is φ = 1530127200.

The previous prime is 2566790353. The next prime is 2566790423. The reversal of 2566790391 is 1930976652.

It is not a de Polignac number, because 2566790391 - 2²¹ = 2564693239 is a prime.

It is a super-2 number, since 2×2566790391² = 13176825822659865762, 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 2566790391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566790311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635541 + ... + 639566.

It is an arithmetic number, because the mean of its divisors is an integer number (237170088).

Almost surely, 2^2566790391 is an apocalyptic number.

2566790391 is a deficient number, since it is larger than the sum of its proper divisors (1227931017).

2566790391 is a wasteful number, since it uses less digits than its factorization.

2566790391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275182.

The product of its (nonzero) digits is 612360, while the sum is 48.

The square root of 2566790391 is about 50663.5015667097. The cubic root of 2566790391 is about 1369.1892108806.

The spelling of 2566790391 in words is "two billion, five hundred sixty-six million, seven hundred ninety thousand, three hundred ninety-one".