25511454542 has 32 divisors (see below), whose sum is σ = 44239426560. Its totient is φ = 10807384320.

The previous prime is 25511454539. The next prime is 25511454569. The reversal of 25511454542 is 24545411552.

It is a junction number, because it is equal to n+sod(n) for n = 25511454496 and 25511454505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128167 + ... + 1150557.

It is an arithmetic number, because the mean of its divisors is an integer number (1382482080).

Almost surely, 2^25511454542 is an apocalyptic number.

25511454542 is a deficient number, since it is larger than the sum of its proper divisors (18727972018).

25511454542 is a wasteful number, since it uses less digits than its factorization.

25511454542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23336.

The product of its digits is 160000, while the sum is 38.

Subtracting from 25511454542 its reverse (24545411552), we obtain a triangular number (966042990 = T₄₃₉₅₅).

The spelling of 25511454542 in words is "twenty-five billion, five hundred eleven million, four hundred fifty-four thousand, five hundred forty-two".