145780661 has 16 divisors (see below), whose sum is σ = 166643568. Its totient is φ = 126336000.

The previous prime is 145780639. The next prime is 145780697. The reversal of 145780661 is 166087541.

It can be written as a sum of positive squares in 8 ways, for example, as 6682225 + 139098436 = 2585^2 + 11794^2 .

It is a cyclic number.

It is not a de Polignac number, because 145780661 - 2¹⁰ = 145779637 is a prime.

It is a super-2 number, since 2×145780661² = 42504002243193842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145786661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154451 + ... + 155391.

It is an arithmetic number, because the mean of its divisors is an integer number (10415223).

Almost surely, 2^145780661 is an apocalyptic number.

It is an amenable number.

145780661 is a deficient number, since it is larger than the sum of its proper divisors (20862907).

145780661 is a wasteful number, since it uses less digits than its factorization.

145780661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 145780661 is about 12073.9662497458. The cubic root of 145780661 is about 526.2999212407.

The spelling of 145780661 in words is "one hundred forty-five million, seven hundred eighty thousand, six hundred sixty-one".