25387661061 has 64 divisors (see below), whose sum is σ = 43935989760. Its totient is φ = 14189333760.

The previous prime is 25387661051. The next prime is 25387661107. The reversal of 25387661061 is 16016678352.

25387661061 is a `hidden beast` number, since 2 + 538 + 7 + 6 + 6 + 106 + 1 = 666.

It is not a de Polignac number, because 25387661061 - 2⁵ = 25387661029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25387660998 and 25387661016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25387661041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1696765 + ... + 1711661.

It is an arithmetic number, because the mean of its divisors is an integer number (686499840).

Almost surely, 2^25387661061 is an apocalyptic number.

25387661061 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25387661061 is a deficient number, since it is larger than the sum of its proper divisors (18548328699).

25387661061 is a wasteful number, since it uses less digits than its factorization.

25387661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15111 (or 15105 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 25387661061 in words is "twenty-five billion, three hundred eighty-seven million, six hundred sixty-one thousand, sixty-one".