261646246656734 has 8 divisors (see below), whose sum is σ = 392473197059520. Its totient is φ = 130821847636896.

The previous prime is 261646246656731. The next prime is 261646246656737. The reversal of 261646246656734 is 437656642646162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261646246656731) and next prime (261646246656737).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646246656731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637589339 + ... + 637999574.

It is an arithmetic number, because the mean of its divisors is an integer number (49059149632440).

Almost surely, 2^{261646246656734} is an apocalyptic number.

261646246656734 is a deficient number, since it is larger than the sum of its proper divisors (130826950402786).

261646246656734 is a wasteful number, since it uses less digits than its factorization.

261646246656734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275691474.

The product of its digits is 1254113280, while the sum is 68.

The spelling of 261646246656734 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-six million, six hundred fifty-six thousand, seven hundred thirty-four".