1646156077545 has 64 divisors (see below), whose sum is σ = 3168836352000. Its totient is φ = 712855282176.

The previous prime is 1646156077541. The next prime is 1646156077619. The reversal of 1646156077545 is 5457706516461.

It is not a de Polignac number, because 1646156077545 - 2² = 1646156077541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (1646156077541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25681546 + ... + 25745564.

It is an arithmetic number, because the mean of its divisors is an integer number (49513068000).

Almost surely, 2^{1646156077545} is an apocalyptic number.

1646156077545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1646156077545 is a deficient number, since it is larger than the sum of its proper divisors (1522680274455).

1646156077545 is a wasteful number, since it uses less digits than its factorization.

1646156077545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76942.

The product of its (nonzero) digits is 21168000, while the sum is 57.

The spelling of 1646156077545 in words is "one trillion, six hundred forty-six billion, one hundred fifty-six million, seventy-seven thousand, five hundred forty-five".