261415664034526 has 8 divisors (see below), whose sum is σ = 392133082842864. Its totient is φ = 130704636420240.

The previous prime is 261415664034523. The next prime is 261415664034529. The reversal of 261415664034526 is 625430466514162.

It is an interprime number because it is at equal distance from previous prime (261415664034523) and next prime (261415664034529).

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

It is a super-2 number, since 2×261415664034526² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261415664034523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597696255 + ... + 1597859866.

It is an arithmetic number, because the mean of its divisors is an integer number (49016635355358).

Almost surely, 2^{261415664034526} is an apocalyptic number.

261415664034526 is a deficient number, since it is larger than the sum of its proper divisors (130717418808338).

261415664034526 is a wasteful number, since it uses less digits than its factorization.

261415664034526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195597026.

The product of its (nonzero) digits is 24883200, while the sum is 55.

The spelling of 261415664034526 in words is "two hundred sixty-one trillion, four hundred fifteen billion, six hundred sixty-four million, thirty-four thousand, five hundred twenty-six".