1621505150047 has 4 divisors (see below), whose sum is σ = 1630878012360. Its totient is φ = 1612132287736.

The previous prime is 1621505149991. The next prime is 1621505150053. The reversal of 1621505150047 is 7400515051261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1621505150047 - 2²⁷ = 1621370932319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621505149988 and 1621505150015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621505150087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4686430897 + ... + 4686431242.

It is an arithmetic number, because the mean of its divisors is an integer number (407719503090).

Almost surely, 2^{1621505150047} is an apocalyptic number.

1621505150047 is a deficient number, since it is larger than the sum of its proper divisors (9372862313).

1621505150047 is an equidigital number, since it uses as much as digits as its factorization.

1621505150047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9372862312.

The product of its (nonzero) digits is 42000, while the sum is 37.

The spelling of 1621505150047 in words is "one trillion, six hundred twenty-one billion, five hundred five million, one hundred fifty thousand, forty-seven".