761272651561 has 4 divisors (see below), whose sum is σ = 761310245124. Its totient is φ = 761235058000.

The previous prime is 761272651549. The next prime is 761272651577. The reversal of 761272651561 is 165156272167.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165156272167 = 673 ⋅245403079.

It can be written as a sum of positive squares in 2 ways, for example, as 80177320336 + 681095331225 = 283156^2 + 825285^2 .

It is a cyclic number.

It is not a de Polignac number, because 761272651561 - 2⁹ = 761272651049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (761272651501) 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, 18766390 + ... + 18806911.

It is an arithmetic number, because the mean of its divisors is an integer number (190327561281).

Almost surely, 2^761272651561 is an apocalyptic number.

It is an amenable number.

761272651561 is a deficient number, since it is larger than the sum of its proper divisors (37593563).

761272651561 is a wasteful number, since it uses less digits than its factorization.

761272651561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37593562.

The product of its digits is 1058400, while the sum is 49.

The spelling of 761272651561 in words is "seven hundred sixty-one billion, two hundred seventy-two million, six hundred fifty-one thousand, five hundred sixty-one".