2145156234644 has 6 divisors (see below), whose sum is σ = 3754023410634. Its totient is φ = 1072578117320.

The previous prime is 2145156234643. The next prime is 2145156234653. The reversal of 2145156234644 is 4464326515412.

It can be written as a sum of positive squares in only one way, i.e., 1439068950544 + 706087284100 = 1199612^2 + 840290^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145156234643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268144529327 + ... + 268144529334.

It is an arithmetic number, because the mean of its divisors is an integer number (625670568439).

Almost surely, 2^{2145156234644} is an apocalyptic number.

It is an amenable number.

2145156234644 is a deficient number, since it is larger than the sum of its proper divisors (1608867175990).

2145156234644 is a wasteful number, since it uses less digits than its factorization.

2145156234644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536289058665 (or 536289058663 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 47.

The spelling of 2145156234644 in words is "two trillion, one hundred forty-five billion, one hundred fifty-six million, two hundred thirty-four thousand, six hundred forty-four".