261761401112477 has 4 divisors (see below), whose sum is σ = 299155886985696. Its totient is φ = 224366915239260.

The previous prime is 261761401112429. The next prime is 261761401112479. The reversal of 261761401112477 is 774211104167162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261761401112477 - 2¹⁴ = 261761401096093 is a prime.

It is a super-2 number, since 2×261761401112477² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261761401112479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18697242936599 + ... + 18697242936612.

It is an arithmetic number, because the mean of its divisors is an integer number (74788971746424).

Almost surely, 2^{261761401112477} is an apocalyptic number.

It is an amenable number.

261761401112477 is a deficient number, since it is larger than the sum of its proper divisors (37394485873219).

261761401112477 is an equidigital number, since it uses as much as digits as its factorization.

261761401112477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37394485873218.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 261761401112477 in words is "two hundred sixty-one trillion, seven hundred sixty-one billion, four hundred one million, one hundred twelve thousand, four hundred seventy-seven".