1995642554 has 4 divisors (see below), whose sum is σ = 2993463834. Its totient is φ = 997821276.

The previous prime is 1995642553. The next prime is 1995642557. The reversal of 1995642554 is 4552465991.

It is a happy number.

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., 1822009225 + 173633329 = 42685^2 + 13177^2 .

It is not an unprimeable number, because it can be changed into a prime (1995642553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498910637 + ... + 498910640.

Almost surely, 2^1995642554 is an apocalyptic number.

1995642554 is a deficient number, since it is larger than the sum of its proper divisors (997821280).

1995642554 is an equidigital number, since it uses as much as digits as its factorization.

1995642554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997821279.

The product of its digits is 1944000, while the sum is 50.

The square root of 1995642554 is about 44672.6152581198. The cubic root of 1995642554 is about 1259.0053782511.

The spelling of 1995642554 in words is "one billion, nine hundred ninety-five million, six hundred forty-two thousand, five hundred fifty-four".