72667136477 has 4 divisors (see below), whose sum is σ = 78256916220. Its totient is φ = 67077356736.

The previous prime is 72667136453. The next prime is 72667136551. The reversal of 72667136477 is 77463176627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77463176627 = 11083 ⋅6989369.

It can be written as a sum of positive squares in 2 ways, for example, as 49056048196 + 23611088281 = 221486^2 + 153659^2 .

It is not a de Polignac number, because 72667136477 - 2⁸ = 72667136221 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 (72667136447) 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, 2794889852 + ... + 2794889877.

It is an arithmetic number, because the mean of its divisors is an integer number (19564229055).

Almost surely, 2^72667136477 is an apocalyptic number.

It is an amenable number.

72667136477 is a deficient number, since it is larger than the sum of its proper divisors (5589779743).

72667136477 is a wasteful number, since it uses less digits than its factorization.

72667136477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589779742.

The product of its digits is 12446784, while the sum is 56.

The spelling of 72667136477 in words is "seventy-two billion, six hundred sixty-seven million, one hundred thirty-six thousand, four hundred seventy-seven".