25786770021 has 48 divisors (see below), whose sum is σ = 38959764480. Its totient is φ = 16416449280.

The previous prime is 25786770013. The next prime is 25786770029. The reversal of 25786770021 is 12007768752.

25786770021 is a `hidden beast` number, since 2 + 578 + 6 + 7 + 70 + 0 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (25786770013) and next prime (25786770029).

It is not a de Polignac number, because 25786770021 - 2³ = 25786770013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25786770029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19789656 + ... + 19790958.

It is an arithmetic number, because the mean of its divisors is an integer number (811661760).

Almost surely, 2^25786770021 is an apocalyptic number.

It is an amenable number.

25786770021 is a deficient number, since it is larger than the sum of its proper divisors (13172994459).

25786770021 is a wasteful number, since it uses less digits than its factorization.

25786770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226 (or 2223 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 25786770021 in words is "twenty-five billion, seven hundred eighty-six million, seven hundred seventy thousand, twenty-one".