9919138771061 has 48 divisors (see below), whose sum is σ = 11385553576320. Its totient is φ = 8588479870080.

The previous prime is 9919138771057. The next prime is 9919138771079. The reversal of 9919138771061 is 1601778319199.

9919138771061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9919138771061 - 2² = 9919138771057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9919138770985 and 9919138771003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919138771961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 803618456 + ... + 803630798.

It is an arithmetic number, because the mean of its divisors is an integer number (237199032840).

Almost surely, 2^{9919138771061} is an apocalyptic number.

It is an amenable number.

9919138771061 is a deficient number, since it is larger than the sum of its proper divisors (1466414805259).

9919138771061 is a wasteful number, since it uses less digits than its factorization.

9919138771061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14074 (or 14055 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 62.

The spelling of 9919138771061 in words is "nine trillion, nine hundred nineteen billion, one hundred thirty-eight million, seven hundred seventy-one thousand, sixty-one".