747406661 has 2 divisors, whose sum is σ = 747406662. Its totient is φ = 747406660.

The previous prime is 747406637. The next prime is 747406669. The reversal of 747406661 is 166604747.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412333636 + 335073025 = 20306^2 + 18305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-747406661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (747406669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373703330 + 373703331.

It is an arithmetic number, because the mean of its divisors is an integer number (373703331).

Almost surely, 2^747406661 is an apocalyptic number.

It is an amenable number.

747406661 is a deficient number, since it is larger than the sum of its proper divisors (1).

747406661 is an equidigital number, since it uses as much as digits as its factorization.

747406661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 747406661 is about 27338.7391991657. The cubic root of 747406661 is about 907.5118849362.

The spelling of 747406661 in words is "seven hundred forty-seven million, four hundred six thousand, six hundred sixty-one".