25542063566 has 4 divisors (see below), whose sum is σ = 38313095352. Its totient is φ = 12771031782.

The previous prime is 25542063509. The next prime is 25542063583. The reversal of 25542063566 is 66536024552.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×25542063566² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385515890 + ... + 6385515893.

It is an arithmetic number, because the mean of its divisors is an integer number (9578273838).

Almost surely, 2^25542063566 is an apocalyptic number.

25542063566 is a deficient number, since it is larger than the sum of its proper divisors (12771031786).

25542063566 is a wasteful number, since it uses less digits than its factorization.

25542063566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12771031785.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 25542063566 in words is "twenty-five billion, five hundred forty-two million, sixty-three thousand, five hundred sixty-six".