1368403661 has 16 divisors (see below), whose sum is σ = 1497097728. Its totient is φ = 1245753600.

The previous prime is 1368403613. The next prime is 1368403681. The reversal of 1368403661 is 1663048631.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1368403661 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 (1368403601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53276 + ... + 74666.

It is an arithmetic number, because the mean of its divisors is an integer number (93568608).

Almost surely, 2^1368403661 is an apocalyptic number.

It is an amenable number.

1368403661 is a deficient number, since it is larger than the sum of its proper divisors (128694067).

1368403661 is a wasteful number, since it uses less digits than its factorization.

1368403661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21532.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1368403661 is about 36991.9404870845. The cubic root of 1368403661 is about 1110.2089969800.

The spelling of 1368403661 in words is "one billion, three hundred sixty-eight million, four hundred three thousand, six hundred sixty-one".