261400104440 has 64 divisors (see below), whose sum is σ = 589458816000. Its totient is φ = 104327637120.

The previous prime is 261400104437. The next prime is 261400104443. The reversal of 261400104440 is 44401004162.

It is an interprime number because it is at equal distance from previous prime (261400104437) and next prime (261400104443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261400104443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64082321 + ... + 64086399.

It is an arithmetic number, because the mean of its divisors is an integer number (9210294000).

Almost surely, 2^261400104440 is an apocalyptic number.

261400104440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261400104440 is an abundant number, since it is smaller than the sum of its proper divisors (328058711560).

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

261400104440 is a wasteful number, since it uses less digits than its factorization.

261400104440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260 (or 7256 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The spelling of 261400104440 in words is "two hundred sixty-one billion, four hundred million, one hundred four thousand, four hundred forty".