1621340156541 has 8 divisors (see below), whose sum is σ = 2470613571904. Its totient is φ = 926480089440.

The previous prime is 1621340156533. The next prime is 1621340156567. The reversal of 1621340156541 is 1456510431261.

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

It is not a de Polignac number, because 1621340156541 - 2³ = 1621340156533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621340156541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621340156641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38603337040 + ... + 38603337081.

It is an arithmetic number, because the mean of its divisors is an integer number (308826696488).

Almost surely, 2^{1621340156541} is an apocalyptic number.

It is an amenable number.

1621340156541 is a deficient number, since it is larger than the sum of its proper divisors (849273415363).

1621340156541 is an equidigital number, since it uses as much as digits as its factorization.

1621340156541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77206674131.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 1621340156541 in words is "one trillion, six hundred twenty-one billion, three hundred forty million, one hundred fifty-six thousand, five hundred forty-one".