72974377643 has 2 divisors, whose sum is σ = 72974377644. Its totient is φ = 72974377642.

The previous prime is 72974377639. The next prime is 72974377741. The reversal of 72974377643 is 34677347927.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72974377643 - 2² = 72974377639 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (72974370643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36487188821 + 36487188822.

It is an arithmetic number, because the mean of its divisors is an integer number (36487188822).

Almost surely, 2^72974377643 is an apocalyptic number.

72974377643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72974377643 is an equidigital number, since it uses as much as digits as its factorization.

72974377643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37340352, while the sum is 59.

The spelling of 72974377643 in words is "seventy-two billion, nine hundred seventy-four million, three hundred seventy-seven thousand, six hundred forty-three".