993495661 has 8 divisors (see below), whose sum is σ = 1006690680. Its totient is φ = 980378112.

The previous prime is 993495637. The next prime is 993495683. The reversal of 993495661 is 166594399.

It can be written as a sum of positive squares in 4 ways, for example, as 51926436 + 941569225 = 7206^2 + 30685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 993495661 - 2¹⁵ = 993462893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 993495599 and 993495608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993495761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6681 + ... + 45073.

It is an arithmetic number, because the mean of its divisors is an integer number (125836335).

Almost surely, 2^993495661 is an apocalyptic number.

It is an amenable number.

993495661 is a deficient number, since it is larger than the sum of its proper divisors (13195019).

993495661 is a wasteful number, since it uses less digits than its factorization.

993495661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38735.

The product of its digits is 1574640, while the sum is 52.

The square root of 993495661 is about 31519.7661951988. The cubic root of 993495661 is about 997.8271692259.

The spelling of 993495661 in words is "nine hundred ninety-three million, four hundred ninety-five thousand, six hundred sixty-one".