25400617442 has 8 divisors (see below), whose sum is σ = 38101602396. Its totient is φ = 12700083312.

The previous prime is 25400617409. The next prime is 25400617447. The reversal of 25400617442 is 24471600452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22079285281 + 3321332161 = 148591^2 + 57631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (25400617447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165428 + ... + 279584.

Almost surely, 2^25400617442 is an apocalyptic number.

25400617442 is a deficient number, since it is larger than the sum of its proper divisors (12700984954).

25400617442 is a wasteful number, since it uses less digits than its factorization.

25400617442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225412.

The product of its (nonzero) digits is 53760, while the sum is 35.

The spelling of 25400617442 in words is "twenty-five billion, four hundred million, six hundred seventeen thousand, four hundred forty-two".