201951077906 has 16 divisors (see below), whose sum is σ = 308667408504. Its totient is φ = 99076276224.

The previous prime is 201951077899. The next prime is 201951077929. The reversal of 201951077906 is 609770159102.

It can be written as a sum of positive squares in 4 ways, for example, as 116730872281 + 85220205625 = 341659^2 + 291925^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3555311 + ... + 3611666.

Almost surely, 2^201951077906 is an apocalyptic number.

201951077906 is a deficient number, since it is larger than the sum of its proper divisors (106716330598).

201951077906 is a wasteful number, since it uses less digits than its factorization.

201951077906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167245.

The product of its (nonzero) digits is 238140, while the sum is 47.

The spelling of 201951077906 in words is "two hundred one billion, nine hundred fifty-one million, seventy-seven thousand, nine hundred six".