261153260466 has 32 divisors (see below), whose sum is σ = 632034783360. Its totient is φ = 70226086656.

The previous prime is 261153260461. The next prime is 261153260597. The reversal of 261153260466 is 664062351162.

It is a super-3 number, since 3×261153260466³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (261153260461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182879721 + ... + 182881148.

It is an arithmetic number, because the mean of its divisors is an integer number (19751086980).

Almost surely, 2^261153260466 is an apocalyptic number.

261153260466 is an abundant number, since it is smaller than the sum of its proper divisors (370881522894).

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

261153260466 is a wasteful number, since it uses less digits than its factorization.

261153260466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365760898.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 261153260466 in words is "two hundred sixty-one billion, one hundred fifty-three million, two hundred sixty thousand, four hundred sixty-six".