261732740647 has 12 divisors (see below), whose sum is σ = 304491008640. Its totient is φ = 224322902496.

The previous prime is 261732740611. The next prime is 261732740683. The reversal of 261732740647 is 746047237162.

It is an interprime number because it is at equal distance from previous prime (261732740611) and next prime (261732740683).

It is not a de Polignac number, because 261732740647 - 2⁷ = 261732740519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 261732740647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261732740147) 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, 354523 + ... + 805699.

It is an arithmetic number, because the mean of its divisors is an integer number (25374250720).

Almost surely, 2^261732740647 is an apocalyptic number.

261732740647 is a deficient number, since it is larger than the sum of its proper divisors (42758267993).

261732740647 is a wasteful number, since it uses less digits than its factorization.

261732740647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463030 (or 463023 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 49.

The spelling of 261732740647 in words is "two hundred sixty-one billion, seven hundred thirty-two million, seven hundred forty thousand, six hundred forty-seven".