261142564023660 has 72 divisors (see below), whose sum is σ = 803714800372848. Its totient is φ = 63307288246400.

The previous prime is 261142564023659. The next prime is 261142564023697. The reversal of 261142564023660 is 66320465241162.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17985017811 + ... + 17985032330.

It is an arithmetic number, because the mean of its divisors is an integer number (11162705560734).

Almost surely, 2^{261142564023660} is an apocalyptic number.

261142564023660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261142564023660 is an abundant number, since it is smaller than the sum of its proper divisors (542572236349188).

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

261142564023660 is a wasteful number, since it uses less digits than its factorization.

261142564023660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35970050175 (or 35970050162 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 261142564023660 in words is "two hundred sixty-one trillion, one hundred forty-two billion, five hundred sixty-four million, twenty-three thousand, six hundred sixty".