20111139977 has 2 divisors, whose sum is σ = 20111139978. Its totient is φ = 20111139976.

The previous prime is 20111139973. The next prime is 20111140031. The reversal of 20111139977 is 77993111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19800992656 + 310147321 = 140716^2 + 17611^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111139977 - 2² = 20111139973 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111139973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055569988 + 10055569989.

It is an arithmetic number, because the mean of its divisors is an integer number (10055569989).

Almost surely, 2^20111139977 is an apocalyptic number.

It is an amenable number.

20111139977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111139977 is an equidigital number, since it uses as much as digits as its factorization.

20111139977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 41.

The spelling of 20111139977 in words is "twenty billion, one hundred eleven million, one hundred thirty-nine thousand, nine hundred seventy-seven".