25401770642 has 8 divisors (see below), whose sum is σ = 38105195916. Its totient is φ = 12700038672.

The previous prime is 25401770633. The next prime is 25401770657. The reversal of 25401770642 is 24607710452.

It can be written as a sum of positive squares in 2 ways, for example, as 16952300401 + 8449470241 = 130201^2 + 91921^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 25401770596 and 25401770605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385133 + ... + 446240.

Almost surely, 2^25401770642 is an apocalyptic number.

25401770642 is a deficient number, since it is larger than the sum of its proper divisors (12703425274).

25401770642 is a wasteful number, since it uses less digits than its factorization.

25401770642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846652.

The product of its (nonzero) digits is 94080, while the sum is 38.

The spelling of 25401770642 in words is "twenty-five billion, four hundred one million, seven hundred seventy thousand, six hundred forty-two".