72270510661 has 4 divisors (see below), whose sum is σ = 72442994400. Its totient is φ = 72098026924.

The previous prime is 72270510527. The next prime is 72270510671. The reversal of 72270510661 is 16601507227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72270510661 is a prime.

It is a super-2 number, since 2×72270510661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72270510661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72270510671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86241241 + ... + 86242078.

It is an arithmetic number, because the mean of its divisors is an integer number (18110748600).

Almost surely, 2^72270510661 is an apocalyptic number.

It is an amenable number.

72270510661 is a deficient number, since it is larger than the sum of its proper divisors (172483739).

72270510661 is a wasteful number, since it uses less digits than its factorization.

72270510661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172483738.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 72270510661 in words is "seventy-two billion, two hundred seventy million, five hundred ten thousand, six hundred sixty-one".