26640464143778 has 16 divisors (see below), whose sum is σ = 40056755515200. Its totient is φ = 13288214108400.

The previous prime is 26640464143669. The next prime is 26640464143817. The reversal of 26640464143778 is 87734146404662.

It is a super-2 number, since 2×26640464143778² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26640464143778.

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, 30384113 + ... + 31248603.

It is an arithmetic number, because the mean of its divisors is an integer number (2503547219700).

Almost surely, 2^{26640464143778} is an apocalyptic number.

26640464143778 is a deficient number, since it is larger than the sum of its proper divisors (13416291371422).

26640464143778 is a wasteful number, since it uses less digits than its factorization.

26640464143778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901513.

The product of its (nonzero) digits is 130056192, while the sum is 62.

The spelling of 26640464143778 in words is "twenty-six trillion, six hundred forty billion, four hundred sixty-four million, one hundred forty-three thousand, seven hundred seventy-eight".