2115401566 has 4 divisors (see below), whose sum is σ = 3173102352. Its totient is φ = 1057700782.

The previous prime is 2115401551. The next prime is 2115401569. The reversal of 2115401566 is 6651045112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115401569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528850390 + ... + 528850393.

It is an arithmetic number, because the mean of its divisors is an integer number (793275588).

Almost surely, 2^2115401566 is an apocalyptic number.

2115401566 is a deficient number, since it is larger than the sum of its proper divisors (1057700786).

2115401566 is a wasteful number, since it uses less digits than its factorization.

2115401566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057700785.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2115401566 is about 45993.4948226377. The cubic root of 2115401566 is about 1283.7021655485.

Adding to 2115401566 its reverse (6651045112), we get a palindrome (8766446678).

The spelling of 2115401566 in words is "two billion, one hundred fifteen million, four hundred one thousand, five hundred sixty-six".