66400419 has 16 divisors (see below), whose sum is σ = 96768000. Its totient is φ = 40318080.

The previous prime is 66400409. The next prime is 66400423. The reversal of 66400419 is 91400466.

It is not a de Polignac number, because 66400419 - 2⁴ = 66400403 is a prime.

It is a super-2 number, since 2×66400419² = 8818031286751122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66400409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19419 + ... + 22580.

It is an arithmetic number, because the mean of its divisors is an integer number (6048000).

Almost surely, 2^66400419 is an apocalyptic number.

66400419 is a deficient number, since it is larger than the sum of its proper divisors (30367581).

66400419 is a wasteful number, since it uses less digits than its factorization.

66400419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42050.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66400419 is about 8148.6452248211. The cubic root of 66400419 is about 404.9396221530.

The spelling of 66400419 in words is "sixty-six million, four hundred thousand, four hundred nineteen".