1261333573720 has 32 divisors (see below), whose sum is σ = 3096000591120. Its totient is φ = 458666753920.

The previous prime is 1261333573693. The next prime is 1261333573739. The reversal of 1261333573720 is 273753331621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1433333167 + ... + 1433334046.

Almost surely, 2^{1261333573720} is an apocalyptic number.

1261333573720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261333573720 is an abundant number, since it is smaller than the sum of its proper divisors (1834667017400).

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

1261333573720 is a wasteful number, since it uses less digits than its factorization.

1261333573720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866667235 (or 2866667231 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 43.

The spelling of 1261333573720 in words is "one trillion, two hundred sixty-one billion, three hundred thirty-three million, five hundred seventy-three thousand, seven hundred twenty".