25661633412340 has 96 divisors (see below), whose sum is σ = 58619624595840. Its totient is φ = 9404216640000.

The previous prime is 25661633412329. The next prime is 25661633412449. The reversal of 25661633412340 is 4321433616652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6124311 + ... + 9424990.

It is an arithmetic number, because the mean of its divisors is an integer number (610621089540).

Almost surely, 2^{25661633412340} is an apocalyptic number.

25661633412340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25661633412340 is an abundant number, since it is smaller than the sum of its proper divisors (32957991183500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25661633412340 is a wasteful number, since it uses less digits than its factorization.

25661633412340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15549473 (or 15549471 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 46.

The spelling of 25661633412340 in words is "twenty-five trillion, six hundred sixty-one billion, six hundred thirty-three million, four hundred twelve thousand, three hundred forty".