26610578978 has 8 divisors (see below), whose sum is σ = 39921605568. Its totient is φ = 13303377124.

The previous prime is 26610578971. The next prime is 26610578987. The reversal of 26610578978 is 87987501662.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (26610578971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938726 + ... + 966657.

It is an arithmetic number, because the mean of its divisors is an integer number (4990200696).

Almost surely, 2^26610578978 is an apocalyptic number.

26610578978 is a deficient number, since it is larger than the sum of its proper divisors (13311026590).

26610578978 is a wasteful number, since it uses less digits than its factorization.

26610578978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912368.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 26610578978 in words is "twenty-six billion, six hundred ten million, five hundred seventy-eight thousand, nine hundred seventy-eight".