25700021903 has 2 divisors, whose sum is σ = 25700021904. Its totient is φ = 25700021902.

The previous prime is 25700021891. The next prime is 25700021917. The reversal of 25700021903 is 30912000752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25700021903 - 2⁴ = 25700021887 is a prime.

It is a super-2 number, since 2×25700021903² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25700021003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12850010951 + 12850010952.

It is an arithmetic number, because the mean of its divisors is an integer number (12850010952).

Almost surely, 2^25700021903 is an apocalyptic number.

25700021903 is a deficient number, since it is larger than the sum of its proper divisors (1).

25700021903 is an equidigital number, since it uses as much as digits as its factorization.

25700021903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The spelling of 25700021903 in words is "twenty-five billion, seven hundred million, twenty-one thousand, nine hundred three".