145401661 has 8 divisors (see below), whose sum is σ = 153326880. Its totient is φ = 137503728.

The previous prime is 145401649. The next prime is 145401667. The reversal of 145401661 is 166104541.

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

It is a cyclic number.

It is not a de Polignac number, because 145401661 - 2¹¹ = 145399613 is a prime.

It is a super-2 number, since 2×145401661² = 42283286043117842, which contains 22 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 (145401667) 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, 4635 + ... + 17671.

It is an arithmetic number, because the mean of its divisors is an integer number (19165860).

Almost surely, 2^145401661 is an apocalyptic number.

It is an amenable number.

145401661 is a deficient number, since it is larger than the sum of its proper divisors (7925219).

145401661 is a wasteful number, since it uses less digits than its factorization.

145401661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13643.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 145401661 is about 12058.2611101269. The cubic root of 145401661 is about 525.8434345862.

Adding to 145401661 its product of nonzero digits (2880), we get a palindrome (145404541).

The spelling of 145401661 in words is "one hundred forty-five million, four hundred one thousand, six hundred sixty-one".