25420156623 has 24 divisors (see below), whose sum is σ = 38323565280. Its totient is φ = 16206094080.

The previous prime is 25420156613. The next prime is 25420156673. The reversal of 25420156623 is 32665102452.

25420156623 is a `hidden beast` number, since 2 + 5 + 4 + 20 + 1 + 5 + 6 + 623 = 666.

It is not a de Polignac number, because 25420156623 - 2¹⁰ = 25420155599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25420156613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1039683 + ... + 1063851.

It is an arithmetic number, because the mean of its divisors is an integer number (1596815220).

Almost surely, 2^25420156623 is an apocalyptic number.

25420156623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25420156623 is a deficient number, since it is larger than the sum of its proper divisors (12903408657).

25420156623 is a wasteful number, since it uses less digits than its factorization.

25420156623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29279 (or 29276 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 25420156623 in words is "twenty-five billion, four hundred twenty million, one hundred fifty-six thousand, six hundred twenty-three".