68650661 has 4 divisors (see below), whose sum is σ = 70247232. Its totient is φ = 67054092.

The previous prime is 68650657. The next prime is 68650693. The reversal of 68650661 is 16605686.

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: 16605686 = 2 ⋅8302843.

It is a cyclic number.

It is not a de Polignac number, because 68650661 - 2² = 68650657 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 (68650261) 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, 798221 + ... + 798306.

It is an arithmetic number, because the mean of its divisors is an integer number (17561808).

Almost surely, 2^68650661 is an apocalyptic number.

It is an amenable number.

68650661 is a deficient number, since it is larger than the sum of its proper divisors (1596571).

68650661 is a wasteful number, since it uses less digits than its factorization.

68650661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596570.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 68650661 is about 8285.5694433153. The cubic root of 68650661 is about 409.4632297526.

The spelling of 68650661 in words is "sixty-eight million, six hundred fifty thousand, six hundred sixty-one".