261945825038 has 8 divisors (see below), whose sum is σ = 393042970488. Its totient is φ = 130931501544.

The previous prime is 261945825019. The next prime is 261945825067. The reversal of 261945825038 is 830528549162.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20697581 + ... + 20710232.

It is an arithmetic number, because the mean of its divisors is an integer number (49130371311).

Almost surely, 2^261945825038 is an apocalyptic number.

261945825038 is a deficient number, since it is larger than the sum of its proper divisors (131097145450).

261945825038 is a wasteful number, since it uses less digits than its factorization.

261945825038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41410978.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 261945825038 in words is "two hundred sixty-one billion, nine hundred forty-five million, eight hundred twenty-five thousand, thirty-eight".