261400104487 has 2 divisors, whose sum is σ = 261400104488. Its totient is φ = 261400104486.

The previous prime is 261400104463. The next prime is 261400104527. The reversal of 261400104487 is 784401004162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261400104487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261400104437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130700052243 + 130700052244.

It is an arithmetic number, because the mean of its divisors is an integer number (130700052244).

Almost surely, 2^261400104487 is an apocalyptic number.

261400104487 is a deficient number, since it is larger than the sum of its proper divisors (1).

261400104487 is an equidigital number, since it uses as much as digits as its factorization.

261400104487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 261400104487 in words is "two hundred sixty-one billion, four hundred million, one hundred four thousand, four hundred eighty-seven".