740515372781 has 2 divisors, whose sum is σ = 740515372782. Its totient is φ = 740515372780.

The previous prime is 740515372771. The next prime is 740515372823. The reversal of 740515372781 is 187273515047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512991142756 + 227524230025 = 716234^2 + 476995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740515372781 is a prime.

It is a super-2 number, since 2×740515372781² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740515372711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370257686390 + 370257686391.

It is an arithmetic number, because the mean of its divisors is an integer number (370257686391).

Almost surely, 2^740515372781 is an apocalyptic number.

It is an amenable number.

740515372781 is a deficient number, since it is larger than the sum of its proper divisors (1).

740515372781 is an equidigital number, since it uses as much as digits as its factorization.

740515372781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1646400, while the sum is 50.

The spelling of 740515372781 in words is "seven hundred forty billion, five hundred fifteen million, three hundred seventy-two thousand, seven hundred eighty-one".