2006157997 has 8 divisors (see below), whose sum is σ = 2123955360. Its totient is φ = 1889581680.

The previous prime is 2006157983. The next prime is 2006158001. The reversal of 2006157997 is 7997516002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2006157997 - 2⁷ = 2006157869 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 (2006157397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301879 + ... + 308452.

It is an arithmetic number, because the mean of its divisors is an integer number (265494420).

Almost surely, 2^2006157997 is an apocalyptic number.

It is an amenable number.

2006157997 is a deficient number, since it is larger than the sum of its proper divisors (117797363).

2006157997 is a wasteful number, since it uses less digits than its factorization.

2006157997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610523.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 2006157997 is about 44790.1551348061. The cubic root of 2006157997 is about 1261.2128233520.

The spelling of 2006157997 in words is "two billion, six million, one hundred fifty-seven thousand, nine hundred ninety-seven".