261147781006 has 32 divisors (see below), whose sum is σ = 453447751680. Its totient is φ = 110479636800.

The previous prime is 261147780961. The next prime is 261147781033. The reversal of 261147781006 is 600187741162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5596351 + ... + 5642821.

It is an arithmetic number, because the mean of its divisors is an integer number (14170242240).

Almost surely, 2^261147781006 is an apocalyptic number.

261147781006 is a deficient number, since it is larger than the sum of its proper divisors (192299970674).

261147781006 is a wasteful number, since it uses less digits than its factorization.

261147781006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51640.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 261147781006 in words is "two hundred sixty-one billion, one hundred forty-seven million, seven hundred eighty-one thousand, six".