161621735047 has 4 divisors (see below), whose sum is σ = 164671201800. Its totient is φ = 158572268296.

The previous prime is 161621734951. The next prime is 161621735053. The reversal of 161621735047 is 740537126161.

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 161621735047 - 2²⁷ = 161487517319 is a prime.

It is a super-2 number, since 2×161621735047² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161621734994 and 161621735012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161621735347) 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, 1524733297 + ... + 1524733402.

It is an arithmetic number, because the mean of its divisors is an integer number (41167800450).

Almost surely, 2^161621735047 is an apocalyptic number.

161621735047 is a deficient number, since it is larger than the sum of its proper divisors (3049466753).

161621735047 is an equidigital number, since it uses as much as digits as its factorization.

161621735047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049466752.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 161621735047 in words is "one hundred sixty-one billion, six hundred twenty-one million, seven hundred thirty-five thousand, forty-seven".