68001557 has 4 divisors (see below), whose sum is σ = 73232460. Its totient is φ = 62770656.

The previous prime is 68001517. The next prime is 68001611. The reversal of 68001557 is 75510086.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9647236 + 58354321 = 3106^2 + 7639^2 .

It is not a de Polignac number, because 68001557 - 2¹⁶ = 67936021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68001517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2615432 + ... + 2615457.

It is an arithmetic number, because the mean of its divisors is an integer number (18308115).

Almost surely, 2^68001557 is an apocalyptic number.

It is an amenable number.

68001557 is a deficient number, since it is larger than the sum of its proper divisors (5230903).

68001557 is a wasteful number, since it uses less digits than its factorization.

68001557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230902.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 68001557 is about 8246.3056576870. The cubic root of 68001557 is about 408.1686254312.

The spelling of 68001557 in words is "sixty-eight million, one thousand, five hundred fifty-seven".