2151989766 has 24 divisors (see below), whose sum is σ = 4664458344. Its totient is φ = 717050880.

The previous prime is 2151989743. The next prime is 2151989767. The reversal of 2151989766 is 6679891512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151989767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27270 + ... + 71046.

It is an arithmetic number, because the mean of its divisors is an integer number (194352431).

Almost surely, 2^2151989766 is an apocalyptic number.

2151989766 is an abundant number, since it is smaller than the sum of its proper divisors (2512468578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151989766 is a wasteful number, since it uses less digits than its factorization.

2151989766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46516 (or 46513 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 2151989766 is about 46389.5437140742. The cubic root of 2151989766 is about 1291.0609156018.

The spelling of 2151989766 in words is "two billion, one hundred fifty-one million, nine hundred eighty-nine thousand, seven hundred sixty-six".