1025643623 has 4 divisors (see below), whose sum is σ = 1070236848. Its totient is φ = 981050400.

The previous prime is 1025643601. The next prime is 1025643629. The reversal of 1025643623 is 3263465201.

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

It is a cyclic number.

It is not a de Polignac number, because 1025643623 - 2²⁴ = 1008866407 is a prime.

It is a super-2 number, since 2×1025643623² = 2103889682801132258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1025643623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025643629) 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, 22296578 + ... + 22296623.

It is an arithmetic number, because the mean of its divisors is an integer number (267559212).

Almost surely, 2^1025643623 is an apocalyptic number.

1025643623 is a deficient number, since it is larger than the sum of its proper divisors (44593225).

1025643623 is an equidigital number, since it uses as much as digits as its factorization.

1025643623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44593224.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1025643623 is about 32025.6713122457. The cubic root of 1025643623 is about 1008.4758316441.

The spelling of 1025643623 in words is "one billion, twenty-five million, six hundred forty-three thousand, six hundred twenty-three".