261655511510342 has 4 divisors (see below), whose sum is σ = 392483267265516. Its totient is φ = 130827755755170.

The previous prime is 261655511510339. The next prime is 261655511510353. The reversal of 261655511510342 is 243015115556162.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65413877877584 + ... + 65413877877587.

It is an arithmetic number, because the mean of its divisors is an integer number (98120816816379).

Almost surely, 2^{261655511510342} is an apocalyptic number.

261655511510342 is a deficient number, since it is larger than the sum of its proper divisors (130827755755174).

261655511510342 is a wasteful number, since it uses less digits than its factorization.

261655511510342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130827755755173.

The product of its (nonzero) digits is 1080000, while the sum is 47.

The spelling of 261655511510342 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, five hundred eleven million, five hundred ten thousand, three hundred forty-two".