1945155625 has 20 divisors (see below), whose sum is σ = 2777910784. Its totient is φ = 1333818000.

The previous prime is 1945155613. The next prime is 1945155629. The reversal of 1945155625 is 5265515491.

It is a happy number.

It is not a de Polignac number, because 1945155625 - 2¹¹ = 1945153577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1945155629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 217929 + ... + 226678.

Almost surely, 2^1945155625 is an apocalyptic number.

It is an amenable number.

1945155625 is a deficient number, since it is larger than the sum of its proper divisors (832755159).

1945155625 is an frugal number, since it uses more digits than its factorization.

1945155625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444634 (or 444619 counting only the distinct ones).

The product of its digits is 270000, while the sum is 43.

The square root of 1945155625 is about 44103.9184767068. The cubic root of 1945155625 is about 1248.2975490479.

It can be divided in two parts, 19451 and 55625, that added together give a square (75076 = 274²).

The spelling of 1945155625 in words is "one billion, nine hundred forty-five million, one hundred fifty-five thousand, six hundred twenty-five".