90216781261 has 16 divisors (see below), whose sum is σ = 91912786560. Its totient is φ = 88533242560.

The previous prime is 90216781243. The next prime is 90216781309. The reversal of 90216781261 is 16218761209.

It is a cyclic number.

It is not a de Polignac number, because 90216781261 - 2⁵ = 90216781229 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 (90216784261) 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, 36420555 + ... + 36423031.

It is an arithmetic number, because the mean of its divisors is an integer number (5744549160).

Almost surely, 2^90216781261 is an apocalyptic number.

It is an amenable number.

90216781261 is a deficient number, since it is larger than the sum of its proper divisors (1696005299).

90216781261 is a wasteful number, since it uses less digits than its factorization.

90216781261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 90216781261 in words is "ninety billion, two hundred sixteen million, seven hundred eighty-one thousand, two hundred sixty-one".