2665401398 has 16 divisors (see below), whose sum is σ = 4367236176. Its totient is φ = 1209971040.

The previous prime is 2665401341. The next prime is 2665401407. The reversal of 2665401398 is 8931045662.

It is a super-2 number, since 2×2665401398² = 14208729224920708808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61361 + ... + 95372.

It is an arithmetic number, because the mean of its divisors is an integer number (272952261).

Almost surely, 2^2665401398 is an apocalyptic number.

2665401398 is a deficient number, since it is larger than the sum of its proper divisors (1701834778).

2665401398 is a wasteful number, since it uses less digits than its factorization.

2665401398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157519.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 2665401398 is about 51627.5255847111. The cubic root of 2665401398 is about 1386.5031919307.

The spelling of 2665401398 in words is "two billion, six hundred sixty-five million, four hundred one thousand, three hundred ninety-eight".