6166621764 has 18 divisors (see below), whose sum is σ = 15587849550. Its totient is φ = 2055540576.

The previous prime is 6166621763. The next prime is 6166621781. The reversal of 6166621764 is 4671266616.

It can be written as a sum of positive squares in only one way, i.e., 4550581764 + 1616040000 = 67458^2 + 40200^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (6166621763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85647489 + ... + 85647560.

Almost surely, 2^6166621764 is an apocalyptic number.

It is an amenable number.

6166621764 is an abundant number, since it is smaller than the sum of its proper divisors (9421227786).

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

6166621764 is a wasteful number, since it uses less digits than its factorization.

6166621764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171295059 (or 171295054 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 6166621764 is about 78527.8406936037. The cubic root of 6166621764 is about 1833.7879042799.

The spelling of 6166621764 in words is "six billion, one hundred sixty-six million, six hundred twenty-one thousand, seven hundred sixty-four".