1025661996 has 36 divisors (see below), whose sum is σ = 2631347992. Its totient is φ = 336783744.

The previous prime is 1025661947. The next prime is 1025661997. The reversal of 1025661996 is 6991665201.

It is a happy number.

1025661996 is a `hidden beast` number, since 1 + 0 + 25 + 6 + 619 + 9 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1025661997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210205 + ... + 215028.

Almost surely, 2^1025661996 is an apocalyptic number.

It is an amenable number.

1025661996 is an abundant number, since it is smaller than the sum of its proper divisors (1605685996).

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

1025661996 is a wasteful number, since it uses less digits than its factorization.

1025661996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425310 (or 425305 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 1025661996 is about 32025.9581589685. The cubic root of 1025661996 is about 1008.4818534290.

The spelling of 1025661996 in words is "one billion, twenty-five million, six hundred sixty-one thousand, nine hundred ninety-six".