1681651680156 has 108 divisors (see below), whose sum is σ = 5235730744608. Its totient is φ = 452208847104.

The previous prime is 1681651680151. The next prime is 1681651680161. The reversal of 1681651680156 is 6510861561861.

It is a happy number.

1681651680156 is a `hidden beast` number, since 1 + 68 + 16 + 516 + 8 + 0 + 1 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (1681651680151) and next prime (1681651680161).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681651680151) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28008756 + ... + 28068731.

It is an arithmetic number, because the mean of its divisors is an integer number (48478988376).

Almost surely, 2^{1681651680156} is an apocalyptic number.

It is an amenable number.

1681651680156 is an abundant number, since it is smaller than the sum of its proper divisors (3554079064452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681651680156 is a wasteful number, since it uses less digits than its factorization.

1681651680156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56077528 (or 56077516 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 1681651680156 in words is "one trillion, six hundred eighty-one billion, six hundred fifty-one million, six hundred eighty thousand, one hundred fifty-six".