66099642 has 32 divisors (see below), whose sum is σ = 156297600. Its totient is φ = 18234048.

The previous prime is 66099619. The next prime is 66099673. The reversal of 66099642 is 24699066.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 66099594 and 66099603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25917 + ... + 28352.

It is an arithmetic number, because the mean of its divisors is an integer number (4884300).

Almost surely, 2^66099642 is an apocalyptic number.

66099642 is an abundant number, since it is smaller than the sum of its proper divisors (90197958).

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

66099642 is a wasteful number, since it uses less digits than its factorization.

66099642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54310.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 66099642 is about 8130.1686329374. The cubic root of 66099642 is about 404.3272721449.

The spelling of 66099642 in words is "sixty-six million, ninety-nine thousand, six hundred forty-two".