1621311160445 has 8 divisors (see below), whose sum is σ = 1993026402360. Its totient is φ = 1265413588480.

The previous prime is 1621311160433. The next prime is 1621311160457. The reversal of 1621311160445 is 5440611131261.

It is an interprime number because it is at equal distance from previous prime (1621311160433) and next prime (1621311160457).

It can be written as a sum of positive squares in 4 ways, for example, as 186495286201 + 1434815874244 = 431851^2 + 1197838^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1621311160445 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3954417260 + ... + 3954417669.

It is an arithmetic number, because the mean of its divisors is an integer number (249128300295).

Almost surely, 2^{1621311160445} is an apocalyptic number.

It is an amenable number.

1621311160445 is a deficient number, since it is larger than the sum of its proper divisors (371715241915).

1621311160445 is an equidigital number, since it uses as much as digits as its factorization.

1621311160445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908834975.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 1621311160445 in words is "one trillion, six hundred twenty-one billion, three hundred eleven million, one hundred sixty thousand, four hundred forty-five".