2661398423801 has 16 divisors (see below), whose sum is σ = 2883681662400. Its totient is φ = 2441638548288.

The previous prime is 2661398423791. The next prime is 2661398423821. The reversal of 2661398423801 is 1083248931662.

It is a cyclic number.

It is not a de Polignac number, because 2661398423801 - 2³⁰ = 2660324681977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2661398423821) 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, 4038215 + ... + 4650803.

It is an arithmetic number, because the mean of its divisors is an integer number (180230103900).

Almost surely, 2^{2661398423801} is an apocalyptic number.

It is an amenable number.

2661398423801 is a deficient number, since it is larger than the sum of its proper divisors (222283238599).

2661398423801 is a wasteful number, since it uses less digits than its factorization.

2661398423801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614648.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 2661398423801 in words is "two trillion, six hundred sixty-one billion, three hundred ninety-eight million, four hundred twenty-three thousand, eight hundred one".