740667661 has 4 divisors (see below), whose sum is σ = 743401024. Its totient is φ = 737934300.

The previous prime is 740667649. The next prime is 740667691. The reversal of 740667661 is 166766047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166766047 = 7 ⋅23823721.

It is a cyclic number.

It is not a de Polignac number, because 740667661 - 2¹¹ = 740665613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740667691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366275 + ... + 1366816.

It is an arithmetic number, because the mean of its divisors is an integer number (185850256).

Almost surely, 2^740667661 is an apocalyptic number.

It is an amenable number.

740667661 is a deficient number, since it is larger than the sum of its proper divisors (2733363).

740667661 is a wasteful number, since it uses less digits than its factorization.

740667661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733362.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 740667661 is about 27215.2101039106. The cubic root of 740667661 is about 904.7761158794.

The spelling of 740667661 in words is "seven hundred forty million, six hundred sixty-seven thousand, six hundred sixty-one".