40278463619581 has 32 divisors (see below), whose sum is σ = 45388822302720. Its totient is φ = 35411189385600.

The previous prime is 40278463619573. The next prime is 40278463619621. The reversal of 40278463619581 is 18591636487204.

It is a cyclic number.

It is not a de Polignac number, because 40278463619581 - 2³ = 40278463619573 is a prime.

It is a super-2 number, since 2×40278463619581² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40278463619531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4892315041 + ... + 4892323273.

It is an arithmetic number, because the mean of its divisors is an integer number (1418400696960).

It is a 1-persistent number, because it is pandigital, but 2⋅40278463619581 = 80556927239162 is not.

Almost surely, 2^{40278463619581} is an apocalyptic number.

It is an amenable number.

40278463619581 is a deficient number, since it is larger than the sum of its proper divisors (5110358683139).

40278463619581 is a wasteful number, since it uses less digits than its factorization.

40278463619581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16417.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 40278463619581 in words is "forty trillion, two hundred seventy-eight billion, four hundred sixty-three million, six hundred nineteen thousand, five hundred eighty-one".