381640116261 has 16 divisors (see below), whose sum is σ = 527962219200. Its totient is φ = 244924447488.

The previous prime is 381640116239. The next prime is 381640116287. The reversal of 381640116261 is 162611046183.

It is not a de Polignac number, because 381640116261 - 2⁷ = 381640116133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381640116061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6479091 + ... + 6537728.

It is an arithmetic number, because the mean of its divisors is an integer number (32997638700).

Almost surely, 2^381640116261 is an apocalyptic number.

It is an amenable number.

381640116261 is a deficient number, since it is larger than the sum of its proper divisors (146322102939).

381640116261 is a wasteful number, since it uses less digits than its factorization.

381640116261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13017188.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 381640116261 in words is "three hundred eighty-one billion, six hundred forty million, one hundred sixteen thousand, two hundred sixty-one".