25978426966 has 4 divisors (see below), whose sum is σ = 38967640452. Its totient is φ = 12989213482.

The previous prime is 25978426949. The next prime is 25978426967. The reversal of 25978426966 is 66962487952.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 25978426898 and 25978426907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25978426967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6494606740 + ... + 6494606743.

It is an arithmetic number, because the mean of its divisors is an integer number (9741910113).

Almost surely, 2^25978426966 is an apocalyptic number.

25978426966 is a deficient number, since it is larger than the sum of its proper divisors (12989213486).

25978426966 is a wasteful number, since it uses less digits than its factorization.

25978426966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12989213485.

The product of its digits is 78382080, while the sum is 64.

The spelling of 25978426966 in words is "twenty-five billion, nine hundred seventy-eight million, four hundred twenty-six thousand, nine hundred sixty-six".