72974373649 has 2 divisors, whose sum is σ = 72974373650. Its totient is φ = 72974373648.

The previous prime is 72974373629. The next prime is 72974373691. The reversal of 72974373649 is 94637347927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51412388049 + 21561985600 = 226743^2 + 146840^2 .

It is a cyclic number.

It is not a de Polignac number, because 72974373649 - 2⁹ = 72974373137 is a prime.

It is not a weakly prime, because it can be changed into another prime (72974373629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36487186824 + 36487186825.

It is an arithmetic number, because the mean of its divisors is an integer number (36487186825).

Almost surely, 2^72974373649 is an apocalyptic number.

It is an amenable number.

72974373649 is a deficient number, since it is larger than the sum of its proper divisors (1).

72974373649 is an equidigital number, since it uses as much as digits as its factorization.

72974373649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48009024, while the sum is 61.

The spelling of 72974373649 in words is "seventy-two billion, nine hundred seventy-four million, three hundred seventy-three thousand, six hundred forty-nine".