997720011 has 10 divisors (see below), whose sum is σ = 1490421372. Its totient is φ = 665146620.

The previous prime is 997720007. The next prime is 997720043. The reversal of 997720011 is 110027799.

It is not a de Polignac number, because 997720011 - 2² = 997720007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997720051) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6158685 + ... + 6158846.

Almost surely, 2^997720011 is an apocalyptic number.

997720011 is a deficient number, since it is larger than the sum of its proper divisors (492701361).

997720011 is a wasteful number, since it uses less digits than its factorization.

997720011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12317543 (or 12317534 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 997720011 is about 31586.7062385428. The cubic root of 997720011 is about 999.2394253395.

The spelling of 997720011 in words is "nine hundred ninety-seven million, seven hundred twenty thousand, eleven".