72409377294691 has 2 divisors, whose sum is σ = 72409377294692. Its totient is φ = 72409377294690.

The previous prime is 72409377294641. The next prime is 72409377294697. The reversal of 72409377294691 is 19649277390427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72409377294691 - 2¹⁷ = 72409377163619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72409377294691.

It is not a weakly prime, because it can be changed into another prime (72409377294697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36204688647345 + 36204688647346.

It is an arithmetic number, because the mean of its divisors is an integer number (36204688647346).

Almost surely, 2^{72409377294691} is an apocalyptic number.

72409377294691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72409377294691 is an equidigital number, since it uses as much as digits as its factorization.

72409377294691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288054144, while the sum is 70.

The spelling of 72409377294691 in words is "seventy-two trillion, four hundred nine billion, three hundred seventy-seven million, two hundred ninety-four thousand, six hundred ninety-one".