2061691681959 has 48 divisors (see below), whose sum is σ = 3783462918144. Its totient is φ = 1052405524800.

The previous prime is 2061691681957. The next prime is 2061691681969. The reversal of 2061691681959 is 9591861961602.

2061691681959 is a `hidden beast` number, since 2 + 0 + 616 + 9 + 1 + 6 + 8 + 1 + 9 + 5 + 9 = 666.

It is not a de Polignac number, because 2061691681959 - 2¹ = 2061691681957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 2061691681896 and 2061691681905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061691681957) 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, 40576677 + ... + 40627454.

It is an arithmetic number, because the mean of its divisors is an integer number (78822144128).

Almost surely, 2^{2061691681959} is an apocalyptic number.

2061691681959 is a deficient number, since it is larger than the sum of its proper divisors (1721771236185).

2061691681959 is a wasteful number, since it uses less digits than its factorization.

2061691681959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81204188 (or 81204185 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The spelling of 2061691681959 in words is "two trillion, sixty-one billion, six hundred ninety-one million, six hundred eighty-one thousand, nine hundred fifty-nine".