145553121661 has 16 divisors (see below), whose sum is σ = 158311964160. Its totient is φ = 133262081280.

The previous prime is 145553121653. The next prime is 145553121677. The reversal of 145553121661 is 166121355541.

145553121661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 145553121661 - 2³ = 145553121653 is a prime.

It is a super-2 number, since 2×145553121661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145553121361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3571960 + ... + 3612478.

It is an arithmetic number, because the mean of its divisors is an integer number (9894497760).

Almost surely, 2^145553121661 is an apocalyptic number.

It is an amenable number.

145553121661 is a deficient number, since it is larger than the sum of its proper divisors (12758842499).

145553121661 is a wasteful number, since it uses less digits than its factorization.

145553121661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46284.

The product of its digits is 108000, while the sum is 40.

The spelling of 145553121661 in words is "one hundred forty-five billion, five hundred fifty-three million, one hundred twenty-one thousand, six hundred sixty-one".