261773403787 has 12 divisors (see below), whose sum is σ = 304644619080. Its totient is φ = 224279424096.

The previous prime is 261773403767. The next prime is 261773403791. The reversal of 261773403787 is 787304377162.

It is not a de Polignac number, because 261773403787 - 2¹⁵ = 261773371019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261773403707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1050337 + ... + 1275442.

It is an arithmetic number, because the mean of its divisors is an integer number (25387051590).

Almost surely, 2^261773403787 is an apocalyptic number.

261773403787 is a deficient number, since it is larger than the sum of its proper divisors (42871215293).

261773403787 is a wasteful number, since it uses less digits than its factorization.

261773403787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328090 (or 2328083 counting only the distinct ones).

The product of its (nonzero) digits is 8297856, while the sum is 55.

The spelling of 261773403787 in words is "two hundred sixty-one billion, seven hundred seventy-three million, four hundred three thousand, seven hundred eighty-seven".