1625387253890 has 8 divisors (see below), whose sum is σ = 2925697057020. Its totient is φ = 650154901552.

The previous prime is 1625387253877. The next prime is 1625387253901. The reversal of 1625387253890 is 983527835261.

It can be written as a sum of positive squares in 2 ways, for example, as 1594969452241 + 30417801649 = 1262921^2 + 174407^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81269362685 + ... + 81269362704.

Almost surely, 2^{1625387253890} is an apocalyptic number.

1625387253890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1625387253890 is a deficient number, since it is larger than the sum of its proper divisors (1300309803130).

1625387253890 is a wasteful number, since it uses less digits than its factorization.

1625387253890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162538725396.

The product of its (nonzero) digits is 21772800, while the sum is 59.

The spelling of 1625387253890 in words is "one trillion, six hundred twenty-five billion, three hundred eighty-seven million, two hundred fifty-three thousand, eight hundred ninety".