1261998408307 has 48 divisors (see below), whose sum is σ = 1579245330432. Its totient is φ = 987379061760.

The previous prime is 1261998408301. The next prime is 1261998408311. The reversal of 1261998408307 is 7038048991621.

It is not a de Polignac number, because 1261998408307 - 2³⁹ = 712242594419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261998408301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46110307 + ... + 46137667.

It is an arithmetic number, because the mean of its divisors is an integer number (32900944384).

Almost surely, 2^{1261998408307} is an apocalyptic number.

1261998408307 is a deficient number, since it is larger than the sum of its proper divisors (317246922125).

1261998408307 is a wasteful number, since it uses less digits than its factorization.

1261998408307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27828 (or 27815 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 1261998408307 in words is "one trillion, two hundred sixty-one billion, nine hundred ninety-eight million, four hundred eight thousand, three hundred seven".