25045143506 has 4 divisors (see below), whose sum is σ = 37567715262. Its totient is φ = 12522571752.

The previous prime is 25045143491. The next prime is 25045143533. The reversal of 25045143506 is 60534154052.

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

It can be written as a sum of positive squares in only one way, i.e., 23657208481 + 1387935025 = 153809^2 + 37255^2 .

It is a super-2 number, since 2×25045143506² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6261285875 + ... + 6261285878.

Almost surely, 2^25045143506 is an apocalyptic number.

25045143506 is a deficient number, since it is larger than the sum of its proper divisors (12522571756).

25045143506 is a wasteful number, since it uses less digits than its factorization.

25045143506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12522571755.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 25045143506 its reverse (60534154052), we get a palindrome (85579297558).

The spelling of 25045143506 in words is "twenty-five billion, forty-five million, one hundred forty-three thousand, five hundred six".