1166521640 has 32 divisors (see below), whose sum is σ = 2779067880. Its totient is φ = 439160832.

The previous prime is 1166521639. The next prime is 1166521669. The reversal of 1166521640 is 461256611.

It can be written as a sum of positive squares in 4 ways, for example, as 1116762724 + 49758916 = 33418^2 + 7054^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1166521597 and 1166521606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 857057 + ... + 858416.

Almost surely, 2^1166521640 is an apocalyptic number.

1166521640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1166521640 is an abundant number, since it is smaller than the sum of its proper divisors (1612546240).

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

1166521640 is a wasteful number, since it uses less digits than its factorization.

1166521640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715501 (or 1715497 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1166521640 is about 34154.3795141999. The cubic root of 1166521640 is about 1052.6829768219.

The spelling of 1166521640 in words is "one billion, one hundred sixty-six million, five hundred twenty-one thousand, six hundred forty".