10665641401978 has 16 divisors (see below), whose sum is σ = 16099782761664. Its totient is φ = 5299137332320.

The previous prime is 10665641401939. The next prime is 10665641401993. The reversal of 10665641401978 is 87910414656601.

It is a happy number.

It is a super-2 number, since 2×10665641401978² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22309150 + ... + 22782217.

It is an arithmetic number, because the mean of its divisors is an integer number (1006236422604).

Almost surely, 2^{10665641401978} is an apocalyptic number.

10665641401978 is a deficient number, since it is larger than the sum of its proper divisors (5434141359686).

10665641401978 is a wasteful number, since it uses less digits than its factorization.

10665641401978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45092117.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 10665641401978 in words is "ten trillion, six hundred sixty-five billion, six hundred forty-one million, four hundred one thousand, nine hundred seventy-eight".