83581197761 has 4 divisors (see below), whose sum is σ = 83599722372. Its totient is φ = 83562673152.

The previous prime is 83581197727. The next prime is 83581197773. The reversal of 83581197761 is 16779118538.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5597284225 + 77983913536 = 74815^2 + 279256^2 .

It is a cyclic number.

It is not a de Polignac number, because 83581197761 - 2³⁴ = 66401328577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83581197697 and 83581197706.

It is not an unprimeable number, because it can be changed into a prime (83581197061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9255536 + ... + 9264561.

It is an arithmetic number, because the mean of its divisors is an integer number (20899930593).

Almost surely, 2^83581197761 is an apocalyptic number.

It is an amenable number.

83581197761 is a deficient number, since it is larger than the sum of its proper divisors (18524611).

83581197761 is a wasteful number, since it uses less digits than its factorization.

83581197761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18524610.

The product of its digits is 2540160, while the sum is 56.

The spelling of 83581197761 in words is "eighty-three billion, five hundred eighty-one million, one hundred ninety-seven thousand, seven hundred sixty-one".