261673880154 has 32 divisors (see below), whose sum is σ = 526622294016. Its totient is φ = 86679150960.

The previous prime is 261673880137. The next prime is 261673880161. The reversal of 261673880154 is 451088376162.

It is a junction number, because it is equal to n+sod(n) for n = 261673880097 and 261673880106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3942019 + ... + 4007849.

It is an arithmetic number, because the mean of its divisors is an integer number (16456946688).

Almost surely, 2^261673880154 is an apocalyptic number.

261673880154 is an abundant number, since it is smaller than the sum of its proper divisors (264948413862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261673880154 is a wasteful number, since it uses less digits than its factorization.

261673880154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69970.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 261673880154 in words is "two hundred sixty-one billion, six hundred seventy-three million, eight hundred eighty thousand, one hundred fifty-four".