261021463051 has 4 divisors (see below), whose sum is σ = 261187614504. Its totient is φ = 260855311600.

The previous prime is 261021463009. The next prime is 261021463063. The reversal of 261021463051 is 150364120162.

It is a happy number.

261021463051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261021463051 - 2¹¹ = 261021461003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261021463751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83073370 + ... + 83076511.

It is an arithmetic number, because the mean of its divisors is an integer number (65296903626).

Almost surely, 2^261021463051 is an apocalyptic number.

261021463051 is a deficient number, since it is larger than the sum of its proper divisors (166151453).

261021463051 is a wasteful number, since it uses less digits than its factorization.

261021463051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166151452.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 261021463051 in words is "two hundred sixty-one billion, twenty-one million, four hundred sixty-three thousand, fifty-one".