740690881981 has 2 divisors, whose sum is σ = 740690881982. Its totient is φ = 740690881980.

The previous prime is 740690881859. The next prime is 740690882023. The reversal of 740690881981 is 189188096047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740690881956 + 25 = 860634^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 740690881981 - 2¹¹ = 740690879933 is a prime.

It is a super-2 number, since 2×740690881981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740690885981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370345440990 + 370345440991.

It is an arithmetic number, because the mean of its divisors is an integer number (370345440991).

Almost surely, 2^740690881981 is an apocalyptic number.

It is an amenable number.

740690881981 is a deficient number, since it is larger than the sum of its proper divisors (1).

740690881981 is an equidigital number, since it uses as much as digits as its factorization.

740690881981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 740690881981 in words is "seven hundred forty billion, six hundred ninety million, eight hundred eighty-one thousand, nine hundred eighty-one".