26478650164 has 18 divisors (see below), whose sum is σ = 46768755110. Its totient is φ = 13116180096.

The previous prime is 26478650131. The next prime is 26478650167. The reversal of 26478650164 is 46105687462.

It can be written as a sum of positive squares in 3 ways, for example, as 21464594064 + 5014056100 = 146508^2 + 70810^2 .

It is a super-2 number, since 2×26478650164² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26478650167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3393852 + ... + 3401644.

Almost surely, 2^26478650164 is an apocalyptic number.

It is an amenable number.

26478650164 is a deficient number, since it is larger than the sum of its proper divisors (20290104946).

26478650164 is an frugal number, since it uses more digits than its factorization.

26478650164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15699 (or 7904 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 26478650164 in words is "twenty-six billion, four hundred seventy-eight million, six hundred fifty thousand, one hundred sixty-four".