6542499840 has 224 divisors, whose sum is σ = 21515466240. Its totient is φ = 1696333824.

The previous prime is 6542499839. The next prime is 6542499853. The reversal of 6542499840 is 489942456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4545841 + ... + 4547279.

Almost surely, 2^6542499840 is an apocalyptic number.

6542499840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6542499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10757733120).

6542499840 is an abundant number, since it is smaller than the sum of its proper divisors (14972966400).

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

6542499840 is a wasteful number, since it uses less digits than its factorization.

6542499840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1486 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The square root of 6542499840 is about 80885.7208659229. The cubic root of 6542499840 is about 1870.3142103105.

The spelling of 6542499840 in words is "six billion, five hundred forty-two million, four hundred ninety-nine thousand, eight hundred forty".