261007778039 has 8 divisors (see below), whose sum is σ = 263435206320. Its totient is φ = 258580947456.

The previous prime is 261007777963. The next prime is 261007778041. The reversal of 261007778039 is 930877700162.

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

It is a cyclic number.

It is not a de Polignac number, because 261007778039 - 2³² = 256712810743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261007778089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753239 + ... + 1043735.

It is an arithmetic number, because the mean of its divisors is an integer number (32929400790).

Almost surely, 2^261007778039 is an apocalyptic number.

261007778039 is a deficient number, since it is larger than the sum of its proper divisors (2427428281).

261007778039 is a wasteful number, since it uses less digits than its factorization.

261007778039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298849.

The product of its (nonzero) digits is 889056, while the sum is 50.

The spelling of 261007778039 in words is "two hundred sixty-one billion, seven million, seven hundred seventy-eight thousand, thirty-nine".