1206532738640 has 40 divisors (see below), whose sum is σ = 2821403612808. Its totient is φ = 479823418880.

The previous prime is 1206532738633. The next prime is 1206532738661. The reversal of 1206532738640 is 468372356021.

It can be written as a sum of positive squares in 4 ways, for example, as 361148113936 + 845384624704 = 600956^2 + 919448^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43574771 + ... + 43602450.

Almost surely, 2^{1206532738640} is an apocalyptic number.

1206532738640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206532738640 is an abundant number, since it is smaller than the sum of its proper divisors (1614870874168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1206532738640 is a wasteful number, since it uses less digits than its factorization.

1206532738640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87177407 (or 87177401 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 1206532738640 in words is "one trillion, two hundred six billion, five hundred thirty-two million, seven hundred thirty-eight thousand, six hundred forty".