66642958 has 16 divisors (see below), whose sum is σ = 108428544. Its totient is φ = 30595840.

The previous prime is 66642949. The next prime is 66642967. The reversal of 66642958 is 85924666.

It is an interprime number because it is at equal distance from previous prime (66642949) and next prime (66642967).

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, 22510 + ... + 25297.

It is an arithmetic number, because the mean of its divisors is an integer number (6776784).

Almost surely, 2^66642958 is an apocalyptic number.

66642958 is a deficient number, since it is larger than the sum of its proper divisors (41785586).

66642958 is a wasteful number, since it uses less digits than its factorization.

66642958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47867.

The product of its digits is 622080, while the sum is 46.

The square root of 66642958 is about 8163.5138267783. The cubic root of 66642958 is about 405.4320603725.

It can be divided in two parts, 66642 and 958, that added together give a square (67600 = 260²).

The spelling of 66642958 in words is "sixty-six million, six hundred forty-two thousand, nine hundred fifty-eight".