27166663640 has 32 divisors (see below), whose sum is σ = 62425529280. Its totient is φ = 10635459072.

The previous prime is 27166663639. The next prime is 27166663669. The reversal of 27166663640 is 4636666172.

It is a super-2 number, since 2×27166663640² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

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, 7223297 + ... + 7227056.

It is an arithmetic number, because the mean of its divisors is an integer number (1950797790).

Almost surely, 2^27166663640 is an apocalyptic number.

27166663640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27166663640 is an abundant number, since it is smaller than the sum of its proper divisors (35258865640).

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

27166663640 is a wasteful number, since it uses less digits than its factorization.

27166663640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14450411 (or 14450407 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 47.

The spelling of 27166663640 in words is "twenty-seven billion, one hundred sixty-six million, six hundred sixty-three thousand, six hundred forty".