73081276661 has 4 divisors (see below), whose sum is σ = 73147896972. Its totient is φ = 73014656352.

The previous prime is 73081276633. The next prime is 73081276663. The reversal of 73081276661 is 16667218037.

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 31396296100 + 41684980561 = 177190^2 + 204169^2 .

It is a cyclic number.

It is not a de Polignac number, because 73081276661 - 2³⁴ = 55901407477 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 (73081276663) 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, 33308510 + ... + 33310703.

It is an arithmetic number, because the mean of its divisors is an integer number (18286974243).

Almost surely, 2^73081276661 is an apocalyptic number.

It is an amenable number.

73081276661 is a deficient number, since it is larger than the sum of its proper divisors (66620311).

73081276661 is a wasteful number, since it uses less digits than its factorization.

73081276661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66620310.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 73081276661 in words is "seventy-three billion, eighty-one million, two hundred seventy-six thousand, six hundred sixty-one".