1261566498 has 48 divisors (see below), whose sum is σ = 2724450624. Its totient is φ = 389264640.

The previous prime is 1261566443. The next prime is 1261566499. The reversal of 1261566498 is 8946651621.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1261566499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99811 + ... + 111737.

It is an arithmetic number, because the mean of its divisors is an integer number (56759388).

Almost surely, 2^1261566498 is an apocalyptic number.

1261566498 is an abundant number, since it is smaller than the sum of its proper divisors (1462884126).

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

1261566498 is a wasteful number, since it uses less digits than its factorization.

1261566498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12027 (or 12010 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 1261566498 is about 35518.5373854273. The cubic root of 1261566498 is about 1080.5297178510.

The spelling of 1261566498 in words is "one billion, two hundred sixty-one million, five hundred sixty-six thousand, four hundred ninety-eight".