749694661 has 4 divisors (see below), whose sum is σ = 752481900. Its totient is φ = 746907424.

The previous prime is 749694653. The next prime is 749694677. The reversal of 749694661 is 166496947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166496947 = 409 ⋅407083.

It can be written as a sum of positive squares in 2 ways, for example, as 240064036 + 509630625 = 15494^2 + 22575^2 .

It is a cyclic number.

It is not a de Polignac number, because 749694661 - 2³ = 749694653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 749694599 and 749694608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749694641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393216 + ... + 1393753.

It is an arithmetic number, because the mean of its divisors is an integer number (188120475).

Almost surely, 2^749694661 is an apocalyptic number.

It is an amenable number.

749694661 is a deficient number, since it is larger than the sum of its proper divisors (2787239).

749694661 is a wasteful number, since it uses less digits than its factorization.

749694661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787238.

The product of its digits is 1959552, while the sum is 52.

The square root of 749694661 is about 27380.5526058186. The cubic root of 749694661 is about 908.4369823946.

The spelling of 749694661 in words is "seven hundred forty-nine million, six hundred ninety-four thousand, six hundred sixty-one".