25405420163651 has 16 divisors (see below), whose sum is σ = 27992041959168. Its totient is φ = 22866073380000.

The previous prime is 25405420163647. The next prime is 25405420163653. The reversal of 25405420163651 is 15636102450452.

It is a cyclic number.

It is not a de Polignac number, because 25405420163651 - 2² = 25405420163647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25405420163653) 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, 27088400 + ... + 28010573.

It is an arithmetic number, because the mean of its divisors is an integer number (1749502622448).

Almost surely, 2^{25405420163651} is an apocalyptic number.

25405420163651 is a deficient number, since it is larger than the sum of its proper divisors (2586621795517).

25405420163651 is a wasteful number, since it uses less digits than its factorization.

25405420163651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55099402.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 25405420163651 in words is "twenty-five trillion, four hundred five billion, four hundred twenty million, one hundred sixty-three thousand, six hundred fifty-one".