661668101079 has 4 divisors (see below), whose sum is σ = 882224134776. Its totient is φ = 441112067384.

The previous prime is 661668101027. The next prime is 661668101117. The reversal of 661668101079 is 970101866166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661668101079 - 2⁹ = 661668100567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661668101179) 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, 110278016844 + ... + 110278016849.

It is an arithmetic number, because the mean of its divisors is an integer number (220556033694).

Almost surely, 2^661668101079 is an apocalyptic number.

661668101079 is a deficient number, since it is larger than the sum of its proper divisors (220556033697).

661668101079 is a wasteful number, since it uses less digits than its factorization.

661668101079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220556033696.

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 661668101079 in words is "six hundred sixty-one billion, six hundred sixty-eight million, one hundred one thousand, seventy-nine".