1377505320521 has 8 divisors (see below), whose sum is σ = 1502804338464. Its totient is φ = 1252218179520.

The previous prime is 1377505320497. The next prime is 1377505320533. The reversal of 1377505320521 is 1250235057731.

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

It is not a de Polignac number, because 1377505320521 - 2¹⁰ = 1377505319497 is a prime.

It is a super-2 number, since 2×1377505320521² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1377505310521) 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, 2725856 + ... + 3191441.

It is an arithmetic number, because the mean of its divisors is an integer number (187850542308).

Almost surely, 2^{1377505320521} is an apocalyptic number.

1377505320521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1377505320521 is a deficient number, since it is larger than the sum of its proper divisors (125299017943).

1377505320521 is a wasteful number, since it uses less digits than its factorization.

1377505320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938471.

The product of its (nonzero) digits is 220500, while the sum is 41.

The spelling of 1377505320521 in words is "one trillion, three hundred seventy-seven billion, five hundred five million, three hundred twenty thousand, five hundred twenty-one".