1641564157890 has 32 divisors (see below), whose sum is σ = 3941380135296. Its totient is φ = 437569758080.

The previous prime is 1641564157889. The next prime is 1641564157979. The reversal of 1641564157890 is 987514651461.

It is a self number, because there is not a number n which added to its sum of digits gives 1641564157890.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11218851 + ... + 11364230.

It is an arithmetic number, because the mean of its divisors is an integer number (123168129228).

Almost surely, 2^{1641564157890} is an apocalyptic number.

1641564157890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1641564157890 is an abundant number, since it is smaller than the sum of its proper divisors (2299815977406).

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

1641564157890 is a wasteful number, since it uses less digits than its factorization.

1641564157890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22585514.

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 1641564157890 in words is "one trillion, six hundred forty-one billion, five hundred sixty-four million, one hundred fifty-seven thousand, eight hundred ninety".