154500709661 has 4 divisors (see below), whose sum is σ = 155354304924. Its totient is φ = 153647114400.

The previous prime is 154500709619. The next prime is 154500709673. The reversal of 154500709661 is 166907005451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166907005451 = 1187 ⋅140612473.

It can be written as a sum of positive squares in 2 ways, for example, as 6502003225 + 147998706436 = 80635^2 + 384706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154500709661 is a prime.

It is a super-3 number, since 3×154500709661³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154500709261) 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, 426797360 + ... + 426797721.

It is an arithmetic number, because the mean of its divisors is an integer number (38838576231).

Almost surely, 2^154500709661 is an apocalyptic number.

It is an amenable number.

154500709661 is a deficient number, since it is larger than the sum of its proper divisors (853595263).

154500709661 is an equidigital number, since it uses as much as digits as its factorization.

154500709661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853595262.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 154500709661 in words is "one hundred fifty-four billion, five hundred million, seven hundred nine thousand, six hundred sixty-one".