261043876867015 has 32 divisors (see below), whose sum is σ = 345977284455936. Its totient is φ = 187492300152960.

The previous prime is 261043876867013. The next prime is 261043876867061. The reversal of 261043876867015 is 510768678340162.

It is not a de Polignac number, because 261043876867015 - 2¹ = 261043876867013 is a prime.

It is a super-2 number, since 2×261043876867015² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261043876867013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1419877 + ... + 22893313.

It is an arithmetic number, because the mean of its divisors is an integer number (10811790139248).

Almost surely, 2^{261043876867015} is an apocalyptic number.

261043876867015 is a deficient number, since it is larger than the sum of its proper divisors (84933407588921).

261043876867015 is a wasteful number, since it uses less digits than its factorization.

261043876867015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21476199.

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 261043876867015 in words is "two hundred sixty-one trillion, forty-three billion, eight hundred seventy-six million, eight hundred sixty-seven thousand, fifteen".